Malicious PDF — malware analysis report

Static analysis result for SHA-256 35690a1042ba0924…

MALICIOUS

PDF

72.1 KB Created: 2020-11-20 01:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 800ea30cc6101be81e7120d55fd3927f SHA-1: 45a521a3d232890b6f61896cad7999800be6b692 SHA-256: 35690a1042ba09241ff2eeb11361a8001e5e4a25980e59578c579928afe6038e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, many of which point to a link farm designed to obscure the ultimate destination. One of the primary links directs to 'traffmen.ru', a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to downloading a manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=introduction+to+linear+optimization+solution+manual+download
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/wudadijunadomem_gogolelafebuw.pdf
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/f66681f42.pdf
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/c7abf.pdf
    • https://jupoviladuxeru.weebly.com/uploads/1/3/4/3/134310568/zuzejokebik-pakulavumevuzo.pdf
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/5075084.pdf
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/kaxufusopebavu-panovonuwa-susuzanubabut-lunokezavez.pdf
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/276684.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/56ebc32a-b5da-4202-946d-ebca6a5b3989/njsp_class_157.pdf
    • https://s3.amazonaws.com/regegozumekoza/spectrum_remote_setup_button.pdf
    • https://s3.amazonaws.com/nademopor/need_of_vocational_guidance.pdf
    • https://s3.amazonaws.com/xuvamuba/dijesovokejexofejinubasur.pdf
    • https://s3.amazonaws.com/bawalidamovidud/patriots_guide_to_american_history.pdf
    • https://s3.amazonaws.com/palikuvexake/sepamikubaxerimi.pdf
    • https://s3.amazonaws.com/pazifetanegapu/matifaxeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdbb.bin
5d89602d1a2f440c5ca83b89edefffd726b8a37095a0758036ea7f364637c582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 5180 bytes
font_01_sfnt_off0000df49.bin
ad45e9e040cf49969929538f133af955e728f03f3390c16b8beeb1157c0b4984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 11148 bytes
font_02_sfnt_off0001050d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 4324 bytes

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