Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd6e0c1e13b3264…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 18:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ccfeeb71331b7af4891f136c022b900 SHA-1: e98f3e8440693782f549c4868274ebda45c5a0d0 SHA-256: 8cd6e0c1e13b3264c9493ff061ac475b3bc4b639c2319e40a684ed0bff33a7cf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/wix?keyword=i+wish+i+was+strong+enough+lyrics+taylor+swift PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456114/normal_604cd33bb98c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fd7976a5ab3c.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/all_things_are_possible_through_christ_who_strengthens_me_tattoo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5ffacfa000054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fe876f79b85e.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/commodore_64_emulator_windows_xp.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/fernando_alonso_crash_indy.pdfIn PDF document text
    • http://kaxasujigunabew.iblogger.org/happy_birthday_pop_up_card_template_free.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/bagikozizebiranib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_7e5d9a106c874da5aceec07d052562b0.pdf?index=trueIn PDF document text
    • http://kasowudut.rf.gd/xubenepupubadizabepekun.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_54870add506c48ef8430ba9713febe25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b8c9ef-c777-40fc-a8ad-1d34f0028df0/three_tier_architecture_data_warehouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9202a0b6-507e-48f6-b595-f25dd3375170/why_is_my_keurig_just_dripping_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba2eeda-1451-436d-8c86-9ab9bdd10b8b/plantronics_m180_earpiece.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111c477c-91f8-4a81-ab4e-b4bb84b72e5d/john_deere_mower_mulching_blades_48.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_79298f49646043908fe76da43fdfb344.pdf?index=trueIn PDF document text
    • http://bazejufojowopor.epizy.com/ezviz_cs-_cv310-_a0-_1b2wfr_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b96e7-4a7c-4549-9bbb-32e72643d4f9/7634785009.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_0a4f526be646450a99fa844aed97473b.pdf?index=trueIn 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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 5276 bytes
SHA-256: 7a9d2a90e18fb12b2d2470e52c758b00e47ecef6b8c4ff01a64b456f7e8043ee
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11444 bytes
SHA-256: f088987f0eb8137acddbd5d7a1caa5a36d138fef3324b66e4e3652695e1cc409