Malicious PDF — malware analysis report

Static analysis result for SHA-256 d723dd7777ae89c4…

MALICIOUS

PDF

73.6 KB Created: 2021-03-05 09:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 301a0f41da4beaa33c021c100d036db1 SHA-1: f1af18cd888a989d22415e1dfe0b785a16310f23 SHA-256: d723dd7777ae89c4bc6a933504293557acb9865353560742e72a471b2a6d5684
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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/award?keyword=how+long+to+charge+jump+start+battery PDF link annotation
    • http://collegegraduatecentraldating.com/built_like_a_badass_reviewxoknl.pdfIn PDF document text
    • http://evakuator-uga.ru/68810355986z14co.pdfIn PDF document text
    • http://alesyasemiletova.com/kusomivijokorh5cxt.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/3691188414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_600add7e716c8.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/how_to_play_riptide_on_ukulele_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_6017756bc7988.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/57152492427.pdfIn PDF document text
    • http://comp-arenda.site/6312730900108fzl.pdfIn PDF document text
    • http://myvenza.ru/86901268393ao0m1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_09977375b41d40de91e3ae9c25b40c80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/2004_ford_focus_sedan_alternator.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_0dedfd6e88644da1a8d5dad06a5edd58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/24681190740.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/wejafopedigerovegim.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/82603383226.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_0fe1578f1e60467f8e0d135eb86c4d57.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_43b1a4f73c5d4bf880d9e7f25523a82f.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_5d900337fe4d47218b4be6389fc5dbe1.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_6311c37b9d664ab8848861f621a15b5d.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_615cc337a61d4e95be4c6b43a552816e.pdf?index=trueIn 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5716 bytes
SHA-256: e92ab4bd77cab3ec5516dd6a9c839049090072c5cba662637c1e42f523389fd5
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10352 bytes
SHA-256: 5d3ab6dcc269a168eb41291b2af0f740c2f93ae3dce5aea7f041b092373158a6

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