Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b77f1daa46d164…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 15:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b2e1c5c052b5f8696c8cc4e6b60c094 SHA-1: 536e5375db310c2c17e6b526ca16c0c2ef80eade SHA-256: e3b77f1daa46d1643a8e1bf6c0eb7434cf10c64972dfcb42a1000284b9c1abcd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the link farm suggest an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/strik?utm_term=killing+pablo+audiobook PDF link annotation
    • http://ueuniti.website/jizif6u4ht.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/hgAjhhc/83790125662.pdfIn PDF document text
    • http://coolvdomaion.online/24949256180j6v3b.pdfIn PDF document text
    • http://cashfree.store/nufok8meau.pdfIn PDF document text
    • http://stnold.com/bavopupegodefem2yj1r.pdfIn PDF document text
    • http://mebelintera.ru/5785850720y2no.pdfIn PDF document text
    • http://scriptbook.xyz/prevencion_primaria_del_cancer_de_mamalkln8.pdfIn PDF document text
    • http://raifaisentgo.online/should_i_use_a_dehumidifier_in_my_basementa7pot.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/ihidnge/54620513054.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/efgjigw/jigarojiki.pdfIn PDF document text
    • http://housefashion.ru/englander_pellet_stove_help3aw5k.pdfIn PDF document text
    • http://contarinihome.com/tewibulegubewuwis4kzw9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_6ea9fc4060a74379833a23711d735ea7.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_53da68a036824d5d9c374a13040b69d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/english_album_songs_2019.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_0db56c119c384129b44874236f690ddc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/refapijagitezosudezi.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_f53da558c61540aa987015edcbe60b58.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_1dd65ccaada64584b9bc4b8392a35b4a.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_f472a36bafc94ed6bf6f428a99de2dc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/former_bctv_news_anchors.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_c5b4d1b853e142f9b6e1951946b3d72a.pdf?index=trueIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_ffe03db1d9e94024a7a399c7d3968f46.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_c8fe71bcdf914fff9f0b227f1f8024bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/wugelux.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_a45b9c74f7ee45bab27aca3c62f92f0d.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 5024 bytes
SHA-256: 9526732e509d8326d703a7639f81aaf0dbf032ac6cc4c28d1bbe489037a3a510
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11416 bytes
SHA-256: 3179db095a3fb5d422be929ccb3eb91a25c33a288dcb6c4cd4289af334c22993

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