Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe2c53e9aa445a…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 20:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c27e6eb9478b46011f44c0faa7fe1dd SHA-1: d5413bc75f80ddb8d248ea77b6da5a3e2f1fe2d6 SHA-256: bcfe2c53e9aa445a32dec98ed88065f571fb64bca99b2e8a320376511e1e6a86
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' parameters suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=the+giver+chapter+discussion+questions PDF link annotation
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/wipumufulos.pdfIn PDF document text
    • https://remenogabeta.weebly.com/uploads/1/3/4/0/134012297/vikodafifigar.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/7275230.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/tejifipepepavuxewexoto.pdfIn PDF document text
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/a9eb20feeaf53.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/bufid.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/bagon-saborosivud-kixitotenof.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/87506407959.pdfIn PDF document text
    • https://jonaditogun.weebly.com/uploads/1/3/1/4/131408899/juvepuguvuribe.pdfIn PDF document text
    • http://rerekuripumeji.22web.org/bijod.pdfIn PDF document text
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/2432102.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/genetics_exam_questions_and_answers.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/xopuvujefo_roniwagonuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d564e9ee-b0ba-4ed7-b44f-52edd1c8a019/15156520611.pdfIn PDF document text
    • http://jilubumidevub.rf.gd/wadopixulizugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b74532-4b1a-4d8f-9d1f-ea12f5929e22/graco_lauren_crib_replacement_hardware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75beff13-69d7-4b61-8e9c-23e9e8676552/what_is_the_next_book_after_diary_of_a_wimpy_kid_wrecking_ball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2e80a5-f53f-49c4-8b9a-7ce48661582e/how_to_use_the_keurig_single_cup_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ee39f4-e7ae-4cf3-b06e-ac48e624bf60/2012_ezgo_rxv_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073e4a3f-2652-41f7-a0d4-643012e36965/turtle_rock_links_awakening_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c960a0d9-06aa-4f09-9bd9-1d4311c9775f/93681823512.pdfIn PDF document text
    • http://kufuravolej.rf.gd/alexander_tamil_dubbed_hd_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d0da70-d751-4260-9300-372488dcebc4/pathoma_2019_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb19f674-7cef-4287-bcd7-0483d0c4ba53/roxotosoketapalusewobe.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/tisirepitidinevowiwavew.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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 5440 bytes
SHA-256: 925c382c281a1259c52d499374b0be4acb3a033a760fb4f8e1944ca4ebdcedc1
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10660 bytes
SHA-256: be34593cf0ab7a561836b7780e47e0fdfe4ca8ecd7caddd74272e7ffaf13ffe3