Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04ff541085e0dab…

MALICIOUS

PDF

80.0 KB Created: 2021-06-02 10:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f07b1d9f2d69a38ce5e0cea6f5224a1 SHA-1: 7c01b9fcf63a224ee3764ca9fabb4412bc6ee86d SHA-256: b04ff541085e0dabf5bd60d56d797e2d2cae0e4ab0ad4ec8db63777b371d182b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection strategy. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful external sites, possibly for further exploitation or phishing.

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-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://drafthe.ru/pbw?utm_term=tableau+diametre+tube+cuivre+frigorifique
    • https://zakulupibuwuvos.weebly.com/uploads/1/3/4/6/134686441/natipokepenava.pdf
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5fdff1624d09e.pdf
    • https://cdn-cms.f-static.net/uploads/4372360/normal_6065ec29a14b8.pdf
    • https://bukojawuwo.weebly.com/uploads/1/3/4/5/134508808/6063827.pdf
    • https://momitoxen.weebly.com/uploads/1/3/7/5/137514133/e36c35b7098.pdf
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601df342718e4.pdf
    • https://cdn-cms.f-static.net/uploads/4494889/normal_603c63efd435f.pdf
    • https://cdn-cms.f-static.net/uploads/4470985/normal_60100295673c4.pdf
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/3886721.pdf
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/legoxutotaka_xusasamoz_lurezafupi.pdf
    • https://kirimanadawa.weebly.com/uploads/1/3/4/3/134383910/gimiwibesurabarow.pdf
    • https://debefapedokofip.weebly.com/uploads/1/3/4/3/134373265/6116487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gazumadu.pbworks.com/f/worksheet_8.4_trig_word_problems_geometry_regular_answers.pdf
    • https://uploads.strikinglycdn.com/files/1b4730a2-d548-471c-8a04-27eb248f11cd/roxivokukugudob.pdf
    • https://uploads.strikinglycdn.com/files/7089b41d-cc1a-4926-92af-306a78a3cd7a/sense_and_sensibility_2008_free_online_streaming.pdf
    • http://joxupakager.pbworks.com/f/electrical_wiring_industrial_14th_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/1f81dd88-b878-423c-b0d5-0b3d8c77ad56/how_to_identify_a_good_diode.pdf
    • https://uploads.strikinglycdn.com/files/dd82eaf3-fbe3-4ee1-9db7-2e265cbfb176/deluxe_then_and_now_bible_maps_-_new_and_expanded_edition.pdf
    • http://sutodoromar.pbworks.com/w/file/fetch/144489729/duxov.pdf
    • https://uploads.strikinglycdn.com/files/0d1f204e-297d-4a2b-9308-917a8c14e8cb/zosagaledetomojakovuk.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea20.bin
18b876cf7e9a13f8968a20dd0ee0a00aac9178cefebb8251067f07a79912c9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 5212 bytes
font_01_sfnt_off0000fbdb.bin
6af65442df5f4a08a36cd95cdfde3d8e24ef418a6bdd7dc535374caa2622cbee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 12176 bytes
font_02_sfnt_off000122a8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 4324 bytes