Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7a9212c4e00bb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-02 04:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5b1f2e9c49ee28a2128ff79c2c68cd SHA-1: e6fea3d598a63134efca9338c0438d14295b540d SHA-256: 85b7a9212c4e00bba4f58e2c65deb8becaf989687b6ccac9b3e23dc7a21f4383
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a lure for MFA/credential harvesting. The document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a phishing campaign. While no scripts were explicitly extracted, the presence of external links and the MFA lure strongly indicate an attempt to trick users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://leonvi.ru/wix?keyword=first+alert+professional+fa215+manual
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/leburebusoxasuv.pdf
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/pigad-toluwezagiwu-rederixev.pdf
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/e5d41768191a48.pdf
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/duduwozevemosilose.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/03def859e73.pdf
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/bovumenokapo-zewetefol-midagupinavaz-zekilawu.pdf
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/1a71f7.pdf
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/bedidoburap.pdf
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/banifaluzuwoduw_totem.pdf
    • https://static.s123-cdn-static.com/uploads/4370052/normal_60094cb27970b.pdf
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/2444367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/feseni/princess_bedtime_stories_to_read_free.pdf
    • https://s3.amazonaws.com/xezonijida/94044330013.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f263.bin
367914741b4d6024f9586d3ebd9c1e886c1b3c2a9b4123ed2e549c9435f7b9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5312 bytes
font_01_sfnt_off00010466.bin
3bde21ad440ac9759c88e79d29ba6b0784c0a2401bff572b433c67076993e31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10324 bytes

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