Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a16f3c4408733b…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 03:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 214e31520da6eaf7b8a3d0d77f19cbdb SHA-1: 23241a33555065f1bac69cedd8206377388aaa4d SHA-256: 04a16f3c4408733ba148a2c9e04056d53b3c38f6a6145e42155ab8754659bce0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one URL specifically mentioning 'fairfield county school district sc jobs' to lure victims. The presence of embedded JavaScript, though not fully analyzed here, is often used in PDFs to facilitate malicious actions like downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/wix?keyword=fairfield+county+school+district+sc+jobs
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/dibekalifekolarapuma.pdf
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/d11ed079c0.pdf
    • https://kupafejesuxab.weebly.com/uploads/1/3/4/6/134650707/1552771.pdf
    • https://tatudibew.weebly.com/uploads/1/3/0/8/130813899/1297258.pdf
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/8550890.pdf
    • http://mp4.design/can_you_lose_weight_through_strength_trainingfd2q6.pdf
    • http://how2clever.com/1168419894248ypb.pdf
    • https://gonupedifi.weebly.com/uploads/1/3/4/5/134524362/zizopelokerogasefe.pdf
    • http://rabisoluvilava.iblogger.org/xobafaporador.pdf
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60688f0729c5f.pdf
    • http://blognews.top/jabra_gn9350_battery_pack5ofjz.pdf
    • http://am-sound.ru/89432282857b6kjr.pdf
    • https://duvibebo.weebly.com/uploads/1/3/4/3/134375256/d9852832ad75933.pdf
    • https://cdn-cms.f-static.net/uploads/4455914/normal_605f80295b8b3.pdf
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6026fb609c2b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jiresigotapikeb.rf.gd/kupunaxumukejurixudidik.pdf
    • http://kepepisex.epizy.com/dulasurar.pdf
    • https://s3.amazonaws.com/fewunadupop/monster_vape_mod.pdf
    • https://s3.amazonaws.com/vovuzize/bitawunex.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin
e31c213fbecec61c08a01f4596f3d02395d14502c6c744d1f20baf919a7f30b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 5380 bytes
font_01_sfnt_off0000f55e.bin
1486b4df8477e662a2aead320feee547ec27e23bed326cf657ba3367ad418c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 11340 bytes
font_02_sfnt_off00011c3f.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 16204 bytes

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