Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e337b72e6297a2…

MALICIOUS

PDF

81.4 KB Created: 2021-03-04 12:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac11eb6b127c2c7f20c03a18e9575b3b SHA-1: 3e9d5154196384312ae67c2f6d72c2d6d8bd7d8a SHA-256: d5e337b72e6297a2db00c2bd9378237ac98324771b0bbdbbdc162b251efad0d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://ponafet.ru/wix?keyword=texas+jurisprudence+study+guide+pdf', suggests a lure for users searching for specific study materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/wix?keyword=texas+jurisprudence+study+guide+pdf PDF link annotation
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/b17189480.pdfIn PDF document text
    • http://usesol.xyz/afterlight_pro_apk_freeyihcq.pdfIn PDF document text
    • http://fb-ig-copyright.com/samsung_galaxy_s5_active_att_unlock_coder9tyh.pdfIn PDF document text
    • http://purpless.vip/spanish_reflexive_verbs_crossword_puzzle_worksheetkfjo7.pdfIn PDF document text
    • https://fatajoser.weebly.com/uploads/1/3/4/6/134655124/bazen.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/kakinapiwudumovunaxu.pdfIn PDF document text
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/namadeki.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/b58d70bb9.pdfIn PDF document text
    • http://br1.red/molopib2fqo.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/7058338.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/rufonali/57623582639.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/una_historia_de_amor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/dragon_quest_ix_armamentalist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/ktm_1290_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/answering_service_care_careers.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/sojameseburikasitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/87052860235.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/secrets_to_spiritual_power_watchman_nee_free_download.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_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 5484 bytes
SHA-256: 1d0c658348ef9282102b387c98222dc4944e85aad512c74aae90259229c7ec7b
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10952 bytes
SHA-256: b70de2be12cd12c20d82098e759b0f2e18d31a5b038dbfe5c71a2f92f8769a38

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