Malicious PDF — malware analysis report

Static analysis result for SHA-256 1616c21e5a6e4ec9…

MALICIOUS

PDF

65.5 KB Created: 2021-02-15 11:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a2ad9d6dbf5c82fec774cc1d32d24529 SHA-1: 30ee453ccc69763ddcdc7bdd61a5d2670c818d81 SHA-256: 1616c21e5a6e4ec9957f8611fb2986e3c7c519758b778aef7038a13e1d88d05a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document is designed to redirect users to potentially harmful content.

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://maypoin.ru/wix?keyword=sports+basketball+unblocked PDF link annotation
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/levoguti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_60228cd61ee80.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/o6xqggR/coffin_acrylic_nails_french_ombre.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/gyfdihA/dinosaur_war_game_free_download.pdfIn PDF document text
    • http://dress-russia.ru/rodos_heykeli_ingilizce_tantm8thiz.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/ijjjhhb/cryorig_r1_ultimate_tdp.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/zamive-fikokarelewo.pdfIn PDF document text
    • http://tonorubur.22web.org/65559722643.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/kmspico_microsoft_office_2016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484641/normal_600722cdbbbdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_6020c6da80343.pdfIn PDF document text
    • http://2022god.com/acc_aha_guidelines_congestive_heart_failure28orb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5feb9f9c0179b.pdfIn PDF document text
    • http://catsism.com/45621222051ffijb.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/c30BCMJ/female_mannequin_torso_dress_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fdf2d14e71db.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49E 5372 bytes
SHA-256: 3423f86b48bbc79299c094a70892764607bdee3fb495f51b9ec275347e449b09
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 10044 bytes
SHA-256: 4a638ee07972922793c9f97f62f01d1f6063223ab21a9653de28710b3c020fa3

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