Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfcbcf07120262f…

MALICIOUS

PDF

79.0 KB Created: 2021-06-07 15:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ca8cc598cd6d1e64faea32550aedbba SHA-1: da4b525e7e5e580a6dede2391882469b29ceba3b SHA-256: edfcbcf07120262f286a82756a087ec54154fdf3fdd1cf6538677ba15ddd1c4f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URLs, many hosted on disposable domains, suggesting a tactic to distribute malicious content or engage in SEO spam. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a game-related term, aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=pokeball+plus+guide+pokemon+go PDF link annotation
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/jewawonofotiz.pdfIn PDF document text
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/6990132.pdfIn PDF document text
    • https://pipumemudif.weebly.com/uploads/1/3/4/8/134866913/915154.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/juvufi_kikubetulu_mumuvu_bapamovupapin.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/kiporatinolapitadiwi.pdfIn PDF document text
    • https://powonevupurig.weebly.com/uploads/1/3/4/7/134704952/vixinani-kixogesegaledi-jurej-pesurone.pdfIn PDF document text
    • https://lonoguvuxa.weebly.com/uploads/1/3/5/3/135320471/buvozefemumugetu.pdfIn PDF document text
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/ludutenakelome-wilenikixevobu-jixik.pdfIn PDF document text
    • https://bewuzitavunu.weebly.com/uploads/1/3/4/3/134349104/nulunoxar-butexag.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/jozolugugena.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/tevimulu-kufoluz-kifafur.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/3345c927-eb54-4d88-9bc7-0b16fbb08927/7017946005.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144771255/wowafudomivas.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144557892/jivizofoxelesizedame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1971eda7-c422-4ebb-a03d-270cc0b31642/5814069688.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/mecanica_de_materiales_beer_johnston_7ta_edicion_solucionario.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144449535/sample_warning_letter_for_absent_without_approval.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/vegekewerigoroxuvoze.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144523167/52341866637.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144521358/tosevikirim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0017962c-8511-45d3-85a3-d6e006083303/what_is_the_organisational_structure_of_mcdonalds.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 4064 bytes
SHA-256: c2d92065cc3ae79e7107948e0c3a5dbc84f3771025a237369208fb5175314f54
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5388 bytes
SHA-256: cc56bd05c8b52d51e390946053f25ab70f1136661e9f8730086e2719a339d97d
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10596 bytes
SHA-256: 0cc0bec0c44e16311d6df114dbe443a855f4bc7bf28e5dbc8c9d96b4213edc0e