Malicious PDF — malware analysis report

Static analysis result for SHA-256 df136bf12605a236…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 03:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b486616cad8c2405c3800926ab8750 SHA-1: 7933a6081862edfd014b348e0e1473dfa2b3d701 SHA-256: df136bf12605a23692745cc957ff45c20ae2e646568ca029cd17bc256183ae87
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be related to a bursary application, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

Heuristics 6

  • 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
  • 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://vilenefex.ru/award?keyword=mpumalanga+bursary+2020+application+form+pdf
    • http://lorozetuwivu.medianewsonline.com/47818892881.pdf
    • https://xetiwomojebiwif.weebly.com/uploads/1/3/4/7/134714835/dd326053fd.pdf
    • https://xojobade.weebly.com/uploads/1/3/4/3/134385351/2358184.pdf
    • http://idealslimitalia-oficial.site/8026977217u1og7.pdf
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5fd0a0c3247b6.pdf
    • http://neuroncraft.online/prepositions_worksheets_with_answers_for_class_9vzi83.pdf
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fe55d55308f5.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/kizuxigegiju.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_600d0ca73c94d.pdf
    • https://cdn-cms.f-static.net/uploads/4466679/normal_602803b411cbf.pdf
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6027679c15683.pdf
    • http://lulopoboxefon.scienceontheweb.net/top_psychology_books_2020.pdf
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/gimanapaniweb_datevu_rapisoguregifu.pdf
    • http://dumubemajizukov.medianewsonline.com/colloquial_arabic.pdf
    • http://simopuvoramawu.mywebcommunity.org/19028336479.pdf
    • http://navelina.iblogger.org/how_to_fix_canon_print_head.pdf
    • http://creditscoreusa.info/panasonic_kx-tg7641_phone6xeir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rodigosixe.rf.gd/how_to_set_wolf_watch_winder.pdf
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_0ef41564b4154f5082cb53783c366b5a.pdf?index=true
    • http://tonezifimoraga.epizy.com/someone_like_you_van_morrison_chords.pdf
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_3b893e6ddcc14be68cd7095268dc3812.pdf?index=true
    • http://segixiw.epizy.com/raxeb.pdf
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_c7f565fe34664916b264d576a9e371f1.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f166.bin
75c4a1c0bd4afaf5feb425c6e6ba78160b91eb85899deae85ee234b90e6fb9b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 5996 bytes
font_01_sfnt_off000105bf.bin
ada313d95b77552ff1eea2909746909a16346bdec0cda6f32a12fce61b5e3fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 11016 bytes

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