Malicious PDF — malware analysis report

Static analysis result for SHA-256 371510c8ee75aeb8…

MALICIOUS

PDF

77.0 KB Created: 2021-01-12 09:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f950df851f58fc63458ebcf111651309 SHA-1: 53a8f5fd9d5e65a17b57cd0bbcc9378a92be62d8 SHA-256: 371510c8ee75aeb836f327edfb7379f69107f331ac63497840dfd34698ed8845
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to drive users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=screen+o+matic+chromebook PDF link annotation
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/482eed.pdfIn PDF document text
    • https://site-1175435.mozfiles.com/files/1175435/christmas_runner_carpet.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/gdAVzh4/koa_radio_weekend_schedule.pdfIn PDF document text
    • https://nixewoxeb.weebly.com/uploads/1/3/4/3/134354190/buwik.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/hcNhcsN/sefekilukibiw.pdfIn PDF document text
    • https://site-1176532.mozfiles.com/files/1176532/farming_simulator_14_windows_phone_cheats.pdfIn PDF document text
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/vileborapiwe.pdfIn PDF document text
    • https://site-1174473.mozfiles.com/files/1174473/walesonline_swansea_crown_court.pdfIn PDF document text
    • https://site-1197000.mozfiles.com/files/1197000/ala_hazrat_image.pdfIn PDF document text
    • https://naxazutip.weebly.com/uploads/1/3/4/6/134610322/8617231.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/haXZtjp/bubble_shooter_bongo_balls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 5136 bytes
SHA-256: 84c9b5f5b0b7b2e721ec23b9884769c0355e38d9fac98e8b19d736231d8ba0b1
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 10560 bytes
SHA-256: 681d996c582c63ccf07c8231b97054db154bde0dab9c9405896b29dc4d90afb9
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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