Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aa0e67a76480d3…

MALICIOUS

PDF

101.1 KB Created: 2021-04-01 02:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1adfac99fa684e39840f23096f563ab SHA-1: 10b1128e7d5e6ee3337bd82d38214d74921d7ec5 SHA-256: 18aa0e67a76480d338fee885e9a561bb64897996866dc582a9740b265c8b9e0e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=mercedes+sprinter+specs+pdf
    • https://cdn.sqhk.co/nojumuku/zgcKcjh/space_wolf_faq.pdf
    • https://cdn.sqhk.co/zexatexa/hftR9ji/jolafasojuboburobizid.pdf
    • https://cdn.sqhk.co/kulizuxekume/hahbifZ/15489289580.pdf
    • https://cdn.sqhk.co/wuluzajiroz/gjuMUz5/lavedavopujikutena.pdf
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601ad6c330f73.pdf
    • http://artyom.guru/can_you_take_sat_subject_tests_more_than_once8zmyx.pdf
    • http://fexuvukenix.22web.org/84472868849.pdf
    • https://cdn-cms.f-static.net/uploads/4470014/normal_6062d97c787d8.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/7504997.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6060fcb18fc0e.pdf
    • http://tikovg.xyz/iowa_code_section_232_ds02gi.pdf
    • http://bestcreditcheck.info/nevapfc94q.pdf
    • https://cdn-cms.f-static.net/uploads/4446924/normal_60129a55349d6.pdf
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/6048658.pdf
    • https://cdn.sqhk.co/pijujuweg/eLuljgk/xekafabekokezuxakuvisaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xetizeburekikat.rf.gd/jamelaw.pdf
    • https://s3.amazonaws.com/gapivegek/bexukusevilo.pdf
    • https://s3.amazonaws.com/vanatul/46744813736.pdf
    • http://lipewolitaden.epizy.com/cape_town_fish_market_menu.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/lotugos.pdf
    • https://s3.amazonaws.com/tosevud/mezofe.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_off0001395b.bin
54163fd78734a8573ae6661ba408915ec7698b83351f1994bda5eecc6b88e08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 4912 bytes
font_01_sfnt_off00014a30.bin
09cb78dc5ea8bbb5b179307ab7291a2175b73f1bce769259d44b431e81cb6af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 12292 bytes
font_02_sfnt_off00017268.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17268 16060 bytes

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