Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4329d7d13e1176…

MALICIOUS

PDF

126.6 KB Created: 2021-05-27 09:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 39928573c56803a1aed2c75b29cae631 SHA-1: 25c1bb2afbbdb7d3de25d0ee4189dc55bc985932 SHA-256: cc4329d7d13e1176a2e5b9500a132f4e75c8671e9ed93e9ad5b3992eb2537393
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. 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 point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zajinet.ru/strik?utm_term=hk+onyx+studio+5+manual PDF link annotation
    • https://vebagikag.weebly.com/uploads/1/3/4/5/134522288/nekegiv.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/2447411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fe778542c19d.pdfIn PDF document text
    • https://degovemidim.weebly.com/uploads/1/3/4/0/134017519/rotetemuvajaref.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/613166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_60524f19ddc1e.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/monoxapej.pdfIn PDF document text
    • https://mikiwugatuvul.weebly.com/uploads/1/3/5/3/135318334/4130709.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/kazefan.pdfIn PDF document text
    • https://romijefovakom.weebly.com/uploads/1/3/1/4/131454567/lofajuxiletimu_goguburuwik_pisifoxadi_kovod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6010cab06a8dd.pdfIn PDF document text
    • https://dewazolasimuf.weebly.com/uploads/1/3/1/4/131453174/4728677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_604b0e51c0acc.pdfIn PDF document text
    • https://sexedevojaboto.weebly.com/uploads/1/3/2/6/132695366/tosenizuxulaga-bavopa-zukonotinira.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/59c2a01e430512b.pdfIn PDF document text
    • https://silolezozuwagu.weebly.com/uploads/1/3/0/7/130774999/vexunevizomivonazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6062a6ea9f2f3.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/goxeforokurep_dalopozo_tozosilug_jekukukuzumaf.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/xigab_fozebalamix.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/8b038b11-48a3-4f71-80d6-c9753709fc5e/bukukiwowoxepubolatiwox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1793f58-ee00-40f9-aae4-39bfd3408e62/92941557365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd961a71-2a68-4926-8aff-e9944050522f/nomesutorewatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e42c03d-88aa-4163-be0d-0df76148dfe3/how_to_help_your_child_follow_directions_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8266ad20-18a0-455b-9dad-7cf863c5af7a/movies_like_me_and_earl_and_the_dying_girl_reddit.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 41576 bytes
SHA-256: 754cb9aa555c24d6e157867f552f0a1217a13dd8da5777c88e6899a2677c3722
font_01_sfnt_off000175bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BC 5192 bytes
SHA-256: 2f029e0ef5d04a1cec5ff1e72db7d32b226993b2420bdf052297cf24b8cf8909
font_02_sfnt_off00018762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18762 6140 bytes
SHA-256: 8d0f86d74e4ad165ee76522eaac28fa805dfac675b20331f9743c256f2991d44
font_03_sfnt_off00019f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F04 19760 bytes
SHA-256: 35d8dbb7845e52f7d07e94a972c369a92ca46fd574cf2ad3f12524d2b6c1f086
font_04_sfnt_off0001d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6C0 16148 bytes
SHA-256: 3fe40d35e17ab1ce57c3898b8081a6c8e4bc1f65f9c98f6f54b9b6762c7d16b9

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