Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8037e19cdabe01…

MALICIOUS

PDF

77.3 KB Created: 2021-04-21 14:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c879de8df0c9bae71f03275fbcea1948 SHA-1: 5119dcf9356dcc5bd9a28ad27477268639c215c6 SHA-256: 8f8037e19cdabe016cc77cd3a5e6b2e0d72ca7fa12d40ba1df5a58b65e773f1d
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 0.9998

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://vilenefex.ru/strik?utm_term=pocket+juice+4000mah+price PDF link annotation
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/jigubewenub_novosapazanozab_giwolefewe_bidat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_6036cbf8a7b29.pdfIn PDF document text
    • https://sixobeludid.weebly.com/uploads/1/3/5/2/135298518/serolilojemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_6046b2f1a34ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_605a05f58241b.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/4215774.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/lagigedumirisinola.pdfIn PDF document text
    • https://vibomasovig.weebly.com/uploads/1/3/1/0/131070198/wokupupupeligi-vipumupifiven-dokebowebasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_60008dd8643a9.pdfIn PDF document text
    • http://fosexodepaga.iblogger.org/gauhati_university_bsc_botany_major_syllabus.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/kukedubarajez_razijib_nuxokodelog_nozisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanedabomo.epizy.com/problem_and_solution_passages_5th_grade.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_99177153fec64e52b7241d1fd90647a8.pdf?index=trueIn PDF document text
    • http://fafinonez.rf.gd/mekizefarebufin.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_02ee216a8482490a87476c4ffa4e5abd.pdf?index=trueIn PDF document text
    • http://bojifif.rf.gd/80996641374.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_1c106825fa2c4682921b9c37037a6aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/1001_beers_list.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/advanced_engineering_mathematics_by_rk_jain.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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5336 bytes
SHA-256: 3f7b07a79aa1d42675bdd778b8bb2f75774cacacfc4212ef222293c7d4ade5cb
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 13624 bytes
SHA-256: 99913425cd13ea465ea383bdb4fa035789e2fe54bffa043cd186a462254dcc30

Open this report in the interactive analyzer, or submit your own file for analysis.