Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4733b90a651d899…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 14:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e2c316766290d6fb09c9bba92c1eebf3 SHA-1: d16f111aaae066b4f72b6c9ef1aa61272ec3d900 SHA-256: a4733b90a651d89928278de05a2d267a1c63ab72fd6d326d6711508456ff8775
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO spam campaign. The primary URL, https://baarspo.ru/wix?keyword=12+year+prayer+st+bridget, appears to be a lure to direct users to potentially malicious content.

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://baarspo.ru/wix?keyword=12+year+prayer+st+bridget PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6360928a9c.pdfIn PDF document text
    • https://kanamatadu.weebly.com/uploads/1/3/4/3/134366206/106341.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/putizalusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_603aaef2ee59d.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/milubalikezugeparimaw.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/the_open_window_characters_vera.pdfIn PDF document text
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/47fc18b8.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/fjbFNSK/small_business_startup_grants_oklahoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd60b71bf926.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/ificaje/storypark_information_for_families.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/total_gym_xls_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/ic0gfid/19680876431.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/xetilenorejapa.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/12496406203.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/7957694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_3b4d0279f7034535b8770ce6d7b43c5c.pdf?index=trueIn PDF document text
    • http://bepolujogox.atwebpages.com/middle_school_reading_comprehension.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/kitchenaid_mixer_covers_pattern.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_adebd849b76e43958ddb8fec61efc1ea.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_a644bb4a6698406f971fa316fc3a95e7.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_d78a834958ed4c5ca0b9694154b09bce.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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5424 bytes
SHA-256: a6cc2a7a128cea508cabfcab9b22ca978768f63715eb0c5c330a6b42e04f8549
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10860 bytes
SHA-256: 6be8baf32cd53daceacabedf94456526405e5ee55a2c0459350e187f8b10b3ad