Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8c41bf491ec1fb…

MALICIOUS

PDF

86.2 KB Created: 2021-03-02 21:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b681e03fd99227b39eebc9f57abeacbd SHA-1: 8c990340ff36bd50660a1ce14efa9dac67510c89 SHA-256: ab8c41bf491ec1fb807daa71d0648adf4202440e192b5116a72a779f9e3cfa3a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded links point to various domains, suggesting an attempt to obscure the ultimate destination or to leverage multiple hosting services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=swing+soccer+unblocked PDF link annotation
    • https://cdn.sqhk.co/madumubo/mghgdhb/73236934515.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/balloon_slingshot_for_sale_automaticccak5.pdfIn PDF document text
    • http://limaxinsto.xyz/37365260496jobt7.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/ifEdDif/picosecond_laser_pen_for_wrinkles.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/7c2f55add827aa9.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/8503897.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/i4Bojjw/nazesa.pdfIn PDF document text
    • https://selepofobalolu.weebly.com/uploads/1/3/1/8/131856949/9907694.pdfIn PDF document text
    • https://runuxufugax.weebly.com/uploads/1/3/0/9/130969308/5588681.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/e0293ed23fce.pdfIn PDF document text
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/xoradep-rufubarotifemo.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/evaluating_numerical_expressions_with_exponents_worksheet99iz1.pdfIn PDF document text
    • https://jemiliwolozeli.weebly.com/uploads/1/3/4/8/134870182/rodulix.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/segusasarotaze_debaxa.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/4350209.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/tenoxedevobi.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/Gthjify/nabavenebu.pdfIn PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/4181456.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/7296232.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/pexadunorufapuvem.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_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 5296 bytes
SHA-256: d44a36300b8d056147e58f5cf2b2516c485ab4eb51475bd8efaa377de06987a9
font_01_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 10928 bytes
SHA-256: 728bbc553a4c32ea2201b7d1f52caa74bd6adb4823ee83e5c9a2cd535da7ba17

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