Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a354f6d45da067a…

MALICIOUS

PDF

72.8 KB Created: 2021-01-18 07:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cc7269fafdbe3477224f9a5ec64edb1 SHA-1: 595c910bb2486b52c6cdb393b46523aa55c00cd9 SHA-256: 2a354f6d45da067a1e76b1224a7fe21ba6f961cfb7a5b0c147cc2a2080b8636c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing, that redirects users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/123?utm_term=cost+of+living+in+south+africa+compared+to+uk PDF link annotation
    • https://cdn.sqhk.co/wixefawoz/jP8icH1/hitman_game_of_the_year_edition_review_ps4.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/wagafo.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/k3yi4jd/brahma_bull_hump.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/hf6Mgct/overdrive_city_car_tycoon_game_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/23aQypP/mini_golf_world_championship_hastings.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/xifetepuzigu-vixigol.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/htiaLif/38791497022.pdfIn PDF document text
    • https://kopabiziruzoxol.weebly.com/uploads/1/3/1/4/131406592/watul.pdfIn PDF document text
    • https://lujovimujesami.weebly.com/uploads/1/3/4/0/134019161/gufidefubexe_bebafaguv_majekopifikus_xibuj.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/5475813.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/a7816c60f0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedexim/update_android_samsung_a7_2018.pdfIn PDF document text
    • http://betiravel.epizy.com/bessel_filter.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/febulidijogaxupibop.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/osrs_zamorak_boss_solo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/87462036866.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 5600 bytes
SHA-256: cc329b816881bd551f9b7bdafc3690c9e80833d0b0968f8dbd3fbcde237cde13
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 10740 bytes
SHA-256: b28c1a41a9a509218fd2fe6f2a64b3fa46278aeb9b3a0eb4ebc3a841e8804535

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