Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e10930ff61eacf…

MALICIOUS

PDF

69.1 KB Created: 2021-01-28 16:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 902ce9bf211ac4adeed5154a1783c697 SHA-1: 1e8fbb291991877978e5d3f6ba980a1d2291a771 SHA-256: c1e10930ff61eacfd18fbfb9bfe4b24d5bf814e47a9188be5c01533b25a48af5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=quick+shooter+metal+detector+manual PDF link annotation
    • http://fuckfrsky.com/acrylic_nails_with_rhinestones_designskeprz.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/4620665.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/3f926b2a2.pdfIn PDF document text
    • http://wamawebikojas.22web.org/hiren_boot_iso_full.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/ba8d7682b4a2ff5.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/76bd9347e30.pdfIn PDF document text
    • http://idealicaufficiale.website/nail_salons_near_me_low_pricesvflpd.pdfIn PDF document text
    • http://selizixid.iblogger.org/brc_issue_7_audit_checklist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ff65e7c1990d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovaner.rf.gd/15771857140.pdfIn PDF document text
    • http://xewaxal.epizy.com/diaspora_pronunciation_guide.pdfIn PDF document text
    • http://banidokote.epizy.com/51316050904.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_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 5304 bytes
SHA-256: 786b3a573f95d5f0ec4102e000dbe11177b0a28ed385787459f768d8adc4b755
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 10736 bytes
SHA-256: 89e9c45f642d4395b43c64587c819a783154f8271e0e1feea08d5366fb05424a

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