Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98bfc5fda834d01…

MALICIOUS

PDF

85.3 KB Created: 2021-05-02 22:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f765033e08b4becf16aaea7bc05334e9 SHA-1: a31dc4029d9f18d6cb91482ba7100f414cbf364d SHA-256: b98bfc5fda834d0119dc7898eeef64f31ee62eb301dbf20efb9d855434122400
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary malicious URL identified is a redirector that masquerades as a resource for motivational speech examples, but ultimately leads to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=how+to+write+a+motivational+speech+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6056f891e5f41.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/4ea7c929a37.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/rejewiwifivese-tesaxesip-soxagafaj-zuxewewela.pdfIn PDF document text
    • https://kejazomunago.weebly.com/uploads/1/3/0/7/130776678/talezivazik-sirarisusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_6066b8158b25a.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/5780026.pdfIn PDF document text
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/pufegekimu.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/dcc725daea2f225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_600a8e76064de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_606dc6a35de9e.pdfIn PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/xenasegezi_zenuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_c43f4d8feb824bb5ad123f4eb5138a93.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_f377d85a3e0e406c96a386d9d2456072.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fidiv.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/zomalof.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/gold_platform_shoes_70s.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_13fc00d96247486185e776eaec0e7d0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/48015189103.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/boxuwiwubetusut.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/45302965475.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/xorizopugozemezuzef.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_1373ca9f56984a6abcfc45e8952e7c36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/attribution_theory_psychology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 5140 bytes
SHA-256: a625e6117192a48e80f99812311e128bf3700ff8be7575a94f8de7fa4b3cc5f0
font_01_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 10416 bytes
SHA-256: 83f73cfe51d1df3e697d375ce008511032872ac265a7749172437f26e5705b4f
font_02_sfnt_off00013976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361