Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec8e78abe6af96f…

MALICIOUS

PDF

71.3 KB Created: 2021-03-17 16:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b2c28344d1929cca4606d72d97e3a1f SHA-1: 257fc2e1ac1bb4252dcbfa58470f2f834944dab5 SHA-256: 4ec8e78abe6af96f0be9acd739e768406bc92728b604e1a707f2a4fd567b6958
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=misa+alrededor+de+tu+mesa+partitura+pdf PDF link annotation
    • http://velixone.66ghz.com/vixofuroxaduz.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/silifab.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/gipapijitoganikunig.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/e7224411-5939-4d37-bbb7-9116ed0682e6/47302136472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b5ac33-caf8-41f5-9bb9-52729e91a001/list_of_adverb_words_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7b5ca7-10df-4a7f-b11d-cff06ccf0e47/arms_reach_co_sleeper_assembly_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d7e316-1ff6-46a4-8458-31f9a747db35/83145586167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014263f3-4806-4046-9f63-7107693a3b00/2010_chevy_malibu_ignition_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942864a5-36c6-4c83-95d8-48c3ad017b01/4807519824.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a8bc76ceb3d5434297c6cac69e314a2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/117bedab-1c3e-409e-86d9-705dbc83dc28/50936052029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d2c95b-8a94-4c22-930c-9169da1142ce/fojitolabovatenesoz.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/evermotion_archinteriors_vol_41_showroom.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_dc59a0e6a10a469396dd5d54fbe20a80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f55486f-3a1b-44a5-b58c-d2cf32ac39c7/86984772419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8346f3-8f39-4ceb-8951-c86e2d707605/does_procreate_create_vector_images.pdfIn PDF document text
    • http://jogubemiviju.rf.gd/worilopufitisozidawedez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716e52e0-a124-404e-8497-9178ec08e305/64659758478.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 4968 bytes
SHA-256: e53c4dcf072a4c1474beac2cde9f5ce143c2653ca7d87d48d44b489f3c27f893
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 10496 bytes
SHA-256: 84b4d7acf03b1309d6d8ad41e0b765e24525333d517490933d23fca2679be96a
font_02_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2