Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8f61f3d9656b5c…

MALICIOUS

PDF

74.1 KB Created: 2020-11-18 07:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ebb361c9610c5b3df5fc9306a2d78d4 SHA-1: bf12e61364467dc101cf5cc56aee0999bc4e9054 SHA-256: 2f8f61f3d9656b5cc7f97036b08a2fbac230d1f27122decc9598c63efbdc2062
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://trafficel.ru/aws?utm_term=la+cimbali+m29+select+manual+english PDF link annotation
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/vafajozagod.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/9312641.pdfIn PDF document text
    • https://vataviborabedim.weebly.com/uploads/1/3/4/0/134012391/zanobi.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/a21786ea4c.pdfIn PDF document text
    • https://zuxutupod.weebly.com/uploads/1/3/4/5/134587355/nokevekito_sexiguw_nusezo_xadeku.pdfIn PDF document text
    • https://jozipomona.weebly.com/uploads/1/3/4/4/134479443/109728.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/91742476-525f-4b14-95b1-ddfcdb254683/abraham_kuyper_book.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/40424951274.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/77719952696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f40875-6837-4b35-b2e0-fdb701860f2f/descargar_rufus_2.8.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/my_hat_it_has_three_corners_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5021159-132c-4b26-95c3-4fe102e3d542/gujerumisebenadane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53cb09c-7a02-48de-8322-61a07f8375cf/dark_souls_save_editor_pc_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8782bdb1-c51b-46b0-af35-95065b29f5e8/20108572674.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 5488 bytes
SHA-256: 299cdded39f42ccc573172ffb4e3a8f2a11bb94068653f6fcca004b57a682af4
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 11208 bytes
SHA-256: 611fc957dae591f9ae3694bbb287ad033404a3e21501b61276e19ee18ec8e60a
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16064 bytes
SHA-256: 2e969934b98279dc8aea21a1cfec87ed8458c0d9985c5f19914d6fb4e2e0c341

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