Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761c02962251e2e…

MALICIOUS

PDF

62.1 KB Created: 2021-01-21 17:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a23bedbb49fd2d3468a2379183fb934d SHA-1: b386895dbba536f0d2bc321f02d70b097d79477c SHA-256: 1761c02962251e2ef4a35ecbe2453d33453f9244f56beb9308f34e0db9ba84d9
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign, likely using the embedded links to redirect users to malicious sites.

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
  • 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 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.
  • 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://traffmen.ru/123?utm_term=elements+and+atoms+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fac2b86e23e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd3072f3d8af.pdfIn PDF document text
    • https://site-1178794.mozfiles.com/files/1178794/67894022421.pdfIn PDF document text
    • https://site-1174929.mozfiles.com/files/1174929/vepemafuzirofakurexiser.pdfIn PDF document text
    • https://site-1171850.mozfiles.com/files/1171850/sogotomulidukujuvo.pdfIn PDF document text
    • https://site-1176782.mozfiles.com/files/1176782/96322200094.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/tonikisowubezopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5f9693d813027.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/6d394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5fb9f004687f7.pdfIn PDF document text
    • https://site-1177746.mozfiles.com/files/1177746/arcmap_10__6_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fa7424d02050.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/3143531.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/mufafubabaja_zamuvakake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_5fafba4c731c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5fe07f7a90e23.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/suzuki_bandit_400_parts_manual.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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 5176 bytes
SHA-256: eeca50148b4b7d340335691e9c1ed8f1c06d836f03e9cbf57f3d92b3fea7ba89
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 9764 bytes
SHA-256: 9ef690d986173f0017897fa2d13c1c2d8ef02839b15d8c8b1dbd5664410e28d5

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