Malicious PDF — malware analysis report

Static analysis result for SHA-256 852b30e50d0f4411…

MALICIOUS

PDF

67.3 KB Created: 2021-04-06 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81e5a3a175c48e54ae58b3e5d8652f76 SHA-1: 5f51fbe3e5b4d1bc3b5407557347d4ada99edb7f SHA-256: 852b30e50d0f4411baf05768fb4072cd078df5d362ab18aed38d134d8e3a363a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=assam+tribune+epaper+app+apk PDF link annotation
    • https://cdn.sqhk.co/wimedizi/ggYifb2/46073131821.pdfIn PDF document text
    • http://tranquils.space/musaselimp7j6h.pdfIn PDF document text
    • http://online-bestshop.xyz/panasonic_kx-tga939t_call_forwardingdtq45.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/chain_rule_product_rule_quotient_rule.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/hgjfkcU/20967597031.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/ojivxih/gujimikad.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/jcNggIr/rifujoxogafolawamoru.pdfIn PDF document text
    • http://markettop.pro/vulibenasineloxesaliuo0un.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa41a2bcd6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/6haKhjI/monkey_boxing_apk_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fffc7b97bd18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fe4416c93168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604ceb314f6aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5ffa35d224ea4.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/zakunafu/93895233633.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_c31cad4af4304f06b494c95f513a88dc.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_565808da1430410ab726889eb9ee71a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/equality_act_2018.pdfIn PDF document text
    • http://pasulupumorowim.myartsonline.com/difference_between_centrifugal_compressor_and_axial_flow_compressor.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/kilawevepiwe.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_11d23b3385084819b7ec06e2c9c0b8b1.pdf?index=trueIn 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 5124 bytes
SHA-256: 5cb11cb257353eda25cb968ff0cf62e1b925019d7810df0297c5ed2a4db2f9f1
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 9960 bytes
SHA-256: 84a06d56f4bf81a2087e0a673244f24cfca28dccacdbea98494898d9e627b075

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