Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437c2990a8dd18f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-09 10:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2151bf8cb94a4997c87845895c15ef86 SHA-1: 79090b9ad2f097c951d6a5ebea788e7d6c50892a SHA-256: c437c2990a8dd18ff701fe59ff352fa9b58e50aedd5a670389355617b8fd3d79
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan-d2568dad23a94d95 signature. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational materials, directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=saxon+math+course+3+reteaching+answers PDF link annotation
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/46d6dbc821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fed982812d32.pdfIn PDF document text
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/vobuge.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/dghjjil/20913963916.pdfIn PDF document text
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/4215259.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/739760.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/rozopazadiwox-sapunun.pdfIn PDF document text
    • https://vezaruve.weebly.com/uploads/1/3/1/3/131378950/4167273.pdfIn PDF document text
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/9628567.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/gehjgjZ/45802967643.pdfIn PDF document text
    • https://ronudinogem.weebly.com/uploads/1/3/1/3/131398573/wodog_wobipo_segiwamo_radofinobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_60464a00ab26f.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/3944792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_601cd0d4cf8b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saziwujezad.epizy.com/blowback_chalmers_johnson.pdfIn PDF document text
    • http://nifopufu.epizy.com/65739796476.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_750b38c4539449c88e474c7b96673af2.pdf?index=trueIn PDF document text
    • http://zobawukesilebaf.epizy.com/cruise_boarding_pass_invitation_template_free.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_6caaa6767acf4ccb92477c7553e35849.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5608 bytes
SHA-256: 78d66dc7419e0d79a29c8b526f43a296ff65960259a747d9de66334908aa45fa
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10412 bytes
SHA-256: 6e2aba495aff5c8f5ba18d24c678721eed05c4488f820667426e91bfcd06fce4

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