Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88586408db4aaa7…

MALICIOUS

PDF

81.0 KB Created: 2021-04-08 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4cc2f8af7ceafd98179f9dffc372c973 SHA-1: 55261b66cc4cc7476c48d3485914f262b3172b03 SHA-256: a88586408db4aaa7d33fdff1370ebb4e2f1e07bad0d70039ac097298604102d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('midufefew.ru') that is likely used to host malicious content or facilitate phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malware or phish 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 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=bluford+high+series+set PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5febc5f1f2fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fdad573ec934.pdfIn PDF document text
    • http://wefinexof.iblogger.org/wegugeweko.pdfIn PDF document text
    • http://duwadomet.22web.org/subordinate_conjunctions_exercises_with_answers.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/que_significa_el_justo_segun_la_biblia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_604ff33ab36fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fcb3884cf8ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5fe44ec647495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/30390392315.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/najaged.pdfIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_c8f99ebe1c1f48d1bf7548fd0ccb4c81.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/bagalulaxemoranopetuvifif.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_e37252b7d82f41d3a4a1689325781a4b.pdf?index=trueIn PDF document text
    • http://dijuvunote.onlinewebshop.net/employment_certificate_template.pdfIn PDF document text
    • http://ronojegev.rf.gd/dark_souls_2_scholar_of_the_first_sin_ps4_sale.pdfIn PDF document text
    • http://wamajagi.epizy.com/rogolulimarid.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/jefogoxumemepibesapekup.pdfIn PDF document text
    • http://fizusosikirizi.epizy.com/93678620345.pdfIn PDF document text
    • http://sadevimesi.rf.gd/38088199551.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 5008 bytes
SHA-256: cc6fc279e916ffdeb2072c3a116de2619780e0d6d5ad4a1d43a0460adbcb4ffc
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11616 bytes
SHA-256: b8c691824ae3ebd8065d9dd60c44cdb6766da2ccaf6e0fc4150c9a2f580ad8d1

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