Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca7f7cba2b511e…

MALICIOUS

PDF

81.6 KB Created: 2021-03-03 06:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 94811b84cb3bdeb9c1af1a3b1d6b1d6d SHA-1: 5e47c56bf23066ee018f54d60a1fbb07987c8462 SHA-256: b6ca7f7cba2b511e7cc764a654c3b37c30cb256f8a270650ac9a9d0731d5eff1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

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://resalured.ru/strik?utm_term=traktor+kontrol+s2+mk2+dimensions PDF link annotation
    • http://goloszauniver.fun/rsat_tools_windows_10_1903nh9vb.pdfIn PDF document text
    • http://ideal-it.fun/17903691541rhavx.pdfIn PDF document text
    • http://wigomufeze.22web.org/personal_inventory_sheet_army.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5fd369392f204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fcaf4aba2fd4.pdfIn PDF document text
    • http://beach-fruit.fun/918256425654y6m.pdfIn PDF document text
    • http://leree6.club/bosch_1617_router_motor_diameteryxem5.pdfIn PDF document text
    • http://mikrotikwizard.com/garmin_etrex_30x_handheld_gps_review6vevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5feddc37cbced.pdfIn PDF document text
    • http://betflixguvenilirmi.com/55909215078q2cvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffdcb31afcab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_602fbab28bd0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_6007f016decc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_603e30d2656ea.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/temujonuwu/perevogamipovekote.pdfIn PDF document text
    • http://kavexuvosa.epizy.com/nigirevezoxuzuxidu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/89680191642.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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 5116 bytes
SHA-256: e6213b8caaf586b9fa85f1c54a9f1371f3a478f09bdbd1d4d618b778798fedbc
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 11192 bytes
SHA-256: 187120d65104810be2fc80b714dcdc7ac26812d2cb90a97c6e638ee73089dfa2

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