Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd920fd643d1dcdc…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 23:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 147f68d599311bd6b578e74c380b31f3 SHA-1: 124c0915a7988b81c28256a32d32002f1ac63af9 SHA-256: fd920fd643d1dcdc8735d90795ac00a4422c0cb84c5dd6c87bde9db74371f93c
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=the+very+lonely+firefly+in+spanish In PDF document text
    • https://digexuvin.weebly.com/uploads/1/3/2/8/132814990/direvetizat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_5fd39346e2cbd.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/9573932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6013a1cddd097.pdfIn PDF document text
    • http://itravelimpressions.com/37164564526tvxq6.pdfIn PDF document text
    • http://obzorov.site/bitomisubezio8mba.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/jevurarikasel.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/7020371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_601eb8a5a7531.pdfIn PDF document text
    • http://amst-watch-v1.club/forifawa50a3l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_5fdb906b9ea69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_601eab8c2c623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 5100 bytes
SHA-256: 23c4442d09d1cab21262c669ba4c221bd99d990b05ea6749556eb47d2c7a274a
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10052 bytes
SHA-256: b863b594e76fb494c03115dd0e433a854f97c5bdf55834e227159cf40b25c5f3

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