Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ac268b5f9ce4c…

MALICIOUS

PDF

92.6 KB Created: 2021-04-05 05:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 803052ada13dfafdafae9df66db0d4ea SHA-1: c73cf7ab24d176ff95e7ad0fb60d824c7dfdc9a2 SHA-256: 521ac268b5f9ce4cd143258f63df84856e72b3dc4f343eb383a0b7031923819a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an external URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of embedded URLs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/wix?keyword=describe+the+international+consequences+of+the+russian+revolution PDF link annotation
    • https://cdn.sqhk.co/mugejufunij/jhY2TXJ/thrive_savings_goal_manager_login.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/hdjghhY/sing_karaoke_online_karaoke_record.pdfIn PDF document text
    • http://vehicleusains.com/bodyweight_workout_plan_at_homex7vaa.pdfIn PDF document text
    • http://galoomer.online/lufufisujodamomugoduwabuzlt0.pdfIn PDF document text
    • http://flipping-car.online/labojodatategugiseftk9m0.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/1UgdIAk/motogp_coverage_channel_5.pdfIn PDF document text
    • http://tdsevsvet.ru/youth_football_workout_programsp95s.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/iehwhfE/fomeniwawaponupelebek.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/nwiigex/71897211636.pdfIn PDF document text
    • http://bet-info.ru/fovalivifi3dr4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_9e15395c42bd4c0c9433d263c427ae66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/guxamevafixa.pdfIn PDF document text
    • http://zopetudivukuka.rf.gd/mududigujemeba.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/ark_survival_evolved_digital_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304d9a7b-2294-4451-bfb5-a173f16fe9d5/53116683398.pdfIn PDF document text
    • http://foxivinavil.rf.gd/kixolisidowoxulijavor.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_112142fa07e24acaa197c882e541cd93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffe4872-76d5-43a8-9ad4-1ea8bc7fd8c5/used_sp_shocker_rsx_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/restaurant_3_etoiles_guide_michelin_paris.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_98fc082c10ab4fff9c6be6f5463a7d01.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_60cb33a48549442a9980692386194202.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/how_to_teach_emotional_regulation_autism.pdfIn PDF document text
    • http://nogomazarem.epizy.com/nizubazazu.pdfIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_393ea2e8946e4b63a364001312864485.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/dobaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 6620 bytes
SHA-256: fe256a388a395947ca82ec4890604912a1a82da2ae63cf25598c0efc3f61ddea
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 5176 bytes
SHA-256: f8fb233fb9b648134d460dbe34e15deabc1fbbde72a086671f7e9b796623e928
font_02_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 1688 bytes
SHA-256: 02f764c9ea0d947419dd9a2e09bbbbdfea3c8e363bdd3ca87fe0e9f37e355c21
font_03_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 10444 bytes
SHA-256: 06020ad9d4555eb6105fef66ea5bcda77716f88ea9aba9d5143471f62d0ff8aa
font_04_sfnt_off00013d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1F 16740 bytes
SHA-256: 5fe87113a28ab6f6fdcb55bc613351c08670c2c80735f2b5cfce8825fed4af0c
font_05_sfnt_off00015484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15484 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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