Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e10f824fcbe3eba…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 17:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4e4bc8565672479244a7b3b9c76aa20 SHA-1: bfb013606b9c8d876a8099f264947d5dc7aadc16 SHA-256: 9e10f824fcbe3eba6190bb91f639d3c4c3748176bf375ffebf0f33df8e707797
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=nutritional+value+of+edible+mushrooms+pdf PDF link annotation
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/sisuf.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/0dff4ae46.pdfIn PDF document text
    • http://flylovel.com/how_to_use_serato_dj_lite_with_spotifyskrk1.pdfIn PDF document text
    • http://maska-respirator.shop/lirevekitenarikazu1zn.pdfIn PDF document text
    • http://gegezuwe.iblogger.org/modul_akuntansi_keuangan_desa.pdfIn PDF document text
    • http://fuxejezosajusop.22web.org/belajar_bahasa_inggris_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/MjfhisC/sosuzuk.pdfIn PDF document text
    • http://fakaripeti.xyz/81194658355t68je.pdfIn PDF document text
    • http://hurleyshamburgers.com/dedokilikirifigorupowawegb60qi.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/jajj1jd/nokia_loud_ringtones_free_download.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/gififomubegikalu.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/qhcgjhh/sijaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f92c75b7-77a7-4e54-befe-e4aa5199d29b/pivujumoguwewatuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc870804-0e31-4659-b9fb-5bed279ad130/naruto_3_in_1_volume_13_14_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a245720-55c6-48df-9e2b-97982c92e924/2012_chevy_impala_lt_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d228bab1-0a32-4d50-9e11-ab8e0bc453c5/old_ariens_snowblower_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d62d62c-4f9a-429a-852c-32c283fb9f50/legogepajugososolekibid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57258fd-80a1-4468-9483-618e54f5c87e/a_letter_to_garcia_meaning.pdfIn PDF document text
    • http://zuvemodu.rf.gd/hp_officejet_pro_x476dw_mfp_printhead_replacement.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 5332 bytes
SHA-256: a04dc0d16f6db2717a56956ff7cb0d787bc469727cd1528ffe30f1380ce036b2
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10808 bytes
SHA-256: ebe4c92320e9723453296d4de2c4aaa58678c9a37a08cba8ee8164493eb07643
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378