Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa323218e551aa7…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 09:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2a0e80aeedec082d630d2047d3dbc8ce SHA-1: ed8d77e6ce1738f7ad1c823cfe16c14b12f51495 SHA-256: 8fa323218e551aa7e5cec3eef63d7e9fc70d6ae6e8ccd372adc16adda022269f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=muscle+rack+5-shelf+steel+shelving PDF link annotation
    • http://stopnutristrike.ru/el_burlador_de_sevilla_movimiento_literario4o1eh.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/gagowob.pdfIn PDF document text
    • http://itabody.space/psychological_assessment_samples13kr.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/anemia_perniciosa_tratamiento.pdfIn PDF document text
    • http://molotkov.site/how_to_reset_cisco_router_4200_seriesn0h36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_9dc5cbdf66c94e36984a907e86134da2.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_7a5e4d725967416c887a282296f3e76e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/gta_v_android_apk_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/27358570034.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/simple_formal_attire_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/94968772447.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/how_to_fix_keurig_not_pumping_water.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_fac75914f0054635adc8f1cb6f57b76f.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_c99bc713b6a2470786188f273c43a869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/37000150580.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_3b102ceb8c3b415887381dadd75abeb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/badodemebo/travel_booking_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/41401866770.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_13111e781faa49d18f8ccb379cbc68c6.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_5b373b5b60424fb5baa57bd82b40e2d2.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5428 bytes
SHA-256: 107e140c4f44804c6b473cf3e5dcb2aa1b77d475f2cc3907b0b68e03b1033ab5
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 11412 bytes
SHA-256: 3fa6fa804df0fa075979d1aac5e327764d09d5c7d878c9fe246d6d9b875f573f

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