Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc98ddde748a84d7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 02:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b493fb9eb8d350edb5a4dfde6af5385 SHA-1: d57ca4fd5f83bebe06c5024e813262a25a1abed7 SHA-256: cc98ddde748a84d7c829983def0d48c4ca8097dd011f7f24c82a324d9a240b58
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a mass of external links, including one to 'bologen.ru', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to a 'chemistry chapter 11 practice test answer key'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=chemistry+chapter+11+practice+test+answer+key
    • https://static.s123-cdn-static.com/uploads/4455883/normal_5ff62515e86c3.pdf
    • https://cdn.sqhk.co/jogepirar/hjhI2jg/55346546713.pdf
    • https://cdn.sqhk.co/dibitarebizu/ieHaLgg/snake_plant_propagation_time_lapse.pdf
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/2187566.pdf
    • https://static.s123-cdn-static.com/uploads/4368975/normal_5fef1878a113d.pdf
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/b07607de8496.pdf
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/cd49885394.pdf
    • https://moxuwurenawa.weebly.com/uploads/1/3/0/8/130874588/997909.pdf
    • https://cdn.sqhk.co/sobexofap/Tjh6fvK/xovojafuxululufavakip.pdf
    • https://cdn.sqhk.co/tadawatimi/EhczQ2L/infected_ingrown_hair_under_breast.pdf
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/pirexenapuv.pdf
    • https://cdn.sqhk.co/rarirawibowo/Jqjejig/gasix.pdf
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/sodov.pdf
    • https://paxavolufogese.weebly.com/uploads/1/3/4/6/134600391/84ab82ddb2.pdf
    • https://cdn.sqhk.co/tatonabufule/jihgfhb/vox_cinema_uae_abu_dhabi.pdf
    • https://cdn.sqhk.co/rekubapapup/dijaVia/75461798813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_d156c5f95a6d4b56a73ab3a963a0787e.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_3c414e8560594803ba4d3f240231d3c3.pdf?index=true
    • 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_off0000d719.bin
974fc9700cd4baf18a55b9ec730892dcdf100428f715c85064b51c6bfea2e12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 5356 bytes
font_01_sfnt_off0000e93f.bin
080c88884a3a42d00f7301c3264529f6202914a8c7ce8b5d585066360c4ed4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 10580 bytes
font_02_sfnt_off00010db7.bin
01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16080 bytes

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