Malicious PDF — malware analysis report

Static analysis result for SHA-256 570374439ee02cc7…

MALICIOUS

PDF

84.1 KB Created: 2021-03-15 09:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2504d9b18854b2e0c43ed28ded15a188 SHA-1: 94df269c68e8dfd09fecb48d4540b8cfb20fd2b5 SHA-256: 570374439ee02cc7648bc1fe0af77bb50a641bebe360bf627a3342464b3b753a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=blood+bowl+teams+ranked+2020 PDF link annotation
    • http://by-roof.ru/weather_report_standerton_mpumalangaosux6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5feb71352ba1a.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/aristotle_nicomachean_ethics_summary_book_2.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/minn_kota_power_drive_trolling_motor_foot_pedal_v1_foot_pedal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_60127a5808d86.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/nurosemug.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/c37a4904.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/fa88545.pdfIn PDF document text
    • https://dekixemexiline.weebly.com/uploads/1/3/4/4/134497281/0e19e4.pdfIn PDF document text
    • http://fenellalucynelle.info/megijexakuvaw60rq3.pdfIn PDF document text
    • http://onatural.space/77327575673bag98.pdfIn PDF document text
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/2569709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_60237ecd48d20.pdfIn PDF document text
    • http://autobuff.xyz/zumem599za.pdfIn PDF document text
    • http://goossyy.online/hotpoint_refrigerator_not_cooling_but_freezer_is_fine110nu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_603b116058158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5ffa61229ad3f.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/lipofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_d588d90a0be940c4a9cefec7afb04bb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/chumbak_movie_songs.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_51c0da2d26ae4faf903df1f6d6e9c7fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/zozojibukikotagusix.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_28e1b3519c9a47bd8af5009d00fed6ae.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_57594ab769a8468bacee1c422be71320.pdf?index=trueIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_64a4453538a145ee90e2f73a35c6767a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozilum/orcad_17._2_license_manager.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/general_data_protection_regulation_2018_safeguarding.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/barcode_checker_apk.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_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 5588 bytes
SHA-256: 9fd50cdb6c6f0d565cd79ef61e974662e61bcd30e1f0c3cc4b165bd43a66ad5a
font_01_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 11456 bytes
SHA-256: 9d12e24e38ab91d6678213a6616c40a129950e71849f02a3fa5300fb15e2107d