Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7385065e3e0b577…

MALICIOUS

PDF

90.7 KB Created: 2021-03-26 15:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345b4c1b9fc204fdb781d523118e3753 SHA-1: da70235edf2a26bb0ce3d69fbd3578b5cdaf775c SHA-256: a7385065e3e0b577be4e5ff90da135c863f9b840999706cca34c6ac472ee4094
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. One of the extracted URLs, 'https://golowaki.ru/wix?keyword=affliction+warlock+pve+guide+7.2.5', appears to be a keyword-stuffed URL, further supporting the SEO manipulation or phishing lure hypothesis. No scripts were extracted, but the presence of numerous external links and the high detection scores indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=affliction+warlock+pve+guide+7.2.5
    • https://cdn.sqhk.co/litanamamusi/fIH1Ee6/chicken_shooter_galaxy_attack_download.pdf
    • https://cdn.sqhk.co/ketejeti/ictNzhe/100_doors_games_play_online.pdf
    • https://cdn.sqhk.co/zegapoxasut/RJjdsib/polejuxe.pdf
    • https://cdn.sqhk.co/pugudanirav/dtDJzgd/nick_jonas_and_priyanka_baby.pdf
    • https://cdn.sqhk.co/fimegasaz/3jjfCij/clueless_cast_tv_show.pdf
    • http://kevareso.iblogger.org/tokesomibobapugexufobes.pdf
    • https://cdn.sqhk.co/boxewemutox/hghmgg7/finaxanumelijewe.pdf
    • https://cdn.sqhk.co/joxipadij/X5jj6ih/free_brain_games_online_for_seniors.pdf
    • http://pusejukaxotip.22web.org/68253381028.pdf
    • http://fozakewugumomig.22web.org/circled_red_x_in_aircraft_forms.pdf
    • http://degimogug.mypressonline.com/40471503257.pdf
    • http://nozumupi.medianewsonline.com/ielts_speaking_book_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_bf6d8dc1e70b4a60b26723d285068fc2.pdf?index=true
    • https://11d080c5-195a-43cd-8542-9af39b337c0f.filesusr.com/ugd/9b7d8a_78c40b49b3bc46a5bf532be4d6a24406.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd30.bin
6aec13f179e893a308e0524ac7f89ae61de7d67e30595f4677ecc5eced72da0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 5600 bytes
font_01_sfnt_off0001106c.bin
21020007a728b13b0a27ddcfbcc6ef609d1cb90ba65e71221d9983379a2185dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 12656 bytes
font_02_sfnt_off00013a0d.bin
e80485c0f903ed5ee6f0b7ee166ed7643dfcc4e915eca9bed18fe015875c2694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 16328 bytes
font_03_sfnt_off00014f98.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 4324 bytes

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