Malicious PDF — malware analysis report

Static analysis result for SHA-256 6217d74039ab509a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 05:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 276d5671ffb1c443260646a987ad5189 SHA-1: 03f411a8849b776368a82c09904937e26a55dc76 SHA-256: 6217d74039ab509adaf1b7fa1ef357e241ab167b5f60f18eb7825288a8254c17
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or redirection scheme, likely intended to deliver a secondary payload or lead the user to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=cell+membrane+structure+and+function+pdf In PDF document text
    • http://oneitstore.info/best_swing_trader_strategyernsy.pdfIn PDF document text
    • http://soldonlakewood.com/zawoguparuzedisidwc60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5fec86b7b13a8.pdfIn PDF document text
    • http://tryse.xyz/kavoxilipoponidefijafisowt168.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/qnricjb/freedom_definition_essay.pdfIn PDF document text
    • http://electorat.org/84564676794grbh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60112bd934a2c.pdfIn PDF document text
    • http://rewita.fun/how_to_test_cyberpower_ups_batterypq93z.pdfIn PDF document text
    • http://tacfitproducts.com/thousand_and_one_nights_restaurant_beijingh3yzc.pdfIn PDF document text
    • http://agent-ritual495.online/kogijidesujetusudewudiwudp01kp.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/gFqjekH/17452628389.pdfIn PDF document text
    • http://legko.travel/944381652295klln.pdfIn PDF document text
    • http://pixelbarista.com/79970434687xscf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603ac04e5fe4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benuka/aha_acc_hypertension_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/19619823816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9866431f-84fb-4843-be2a-c6170aac46cc/vanajanotuginipu.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/koborinofewusip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd713bf-e2eb-46d8-96f5-02564b8d4a23/what_is_black_ice_on_the_road.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956b1e93-c51e-4b2a-bcd0-267286960d2d/lirik_lagu_muse_unintended_chord_gitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda93c09-6606-49d7-a86c-d1e60106bb9e/859925135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14017032-b59b-424a-9844-cceebf9050c3/repirijisolakorizu.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 5344 bytes
SHA-256: 5bd4fa3d8dd82e581a52fa9c496497ccd3eeecf937d73786216a8aedac79afec
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10532 bytes
SHA-256: 5f9148208d579be2c345ccb533498b2f35200c8ee66878848dca40cd0c3c4653

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