Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46f998e3d418290…

MALICIOUS

PDF

68.8 KB Created: 2021-02-13 11:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 97fc25d5e36847ab77eedf4c0d77cb68 SHA-1: ab3e49f12b9956b8362ed906329befbfa67eac63 SHA-256: a46f998e3d4182907e23ce3e0f064028c8c59d4549043ffa4025e0c1b3e8f709
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF document contains a large number of links, many pointing to disposable hosting services and utilizing UTM parameters, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a likely intent to lead users to malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=best+bluetooth+transmitter+for+tv+india PDF link annotation
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/vobomamikulinez_gukiweg.pdfIn PDF document text
    • http://robolab.one/tropico_4_soundtrack_downloadi0dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_60184789f0298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd9717b904a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fe94b67a592b.pdfIn PDF document text
    • https://mogiveruxapexi.weebly.com/uploads/1/3/0/7/130775775/noxuwesuva.pdfIn PDF document text
    • http://servisvds.ru/909103922693var5.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/334076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_601c605eddac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472486/normal_5feec0b2ecfa6.pdfIn PDF document text
    • http://sait-ok.ru/silogm3dq8.pdfIn PDF document text
    • http://pagebake.com/26573519736lenvm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fe530b54d173.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/fadadedezeker/gojenirozus.pdfIn PDF document text
    • http://zutibebasonuf.epizy.com/what_s_the_full_form_of_poke.pdfIn PDF document text
    • http://wowadowir.epizy.com/affidavit_format_for_name_change_in_lic.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/helicobacter_pylori_treatment_guidelines_2017.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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 5396 bytes
SHA-256: 31bb21d3d596e4878efdef2de9076adfe38d8021f8c4899323a1600a06832d3b
font_01_sfnt_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 10752 bytes
SHA-256: ef5fac6412614daefe728b9eaf2f9bdf7c8c14ce77bb7348378d163f301b86ee

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