Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4730ca171435f7…

MALICIOUS

PDF

70.2 KB Created: 2021-03-16 18:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01784c70e21ead76610eccce9f83dc2c SHA-1: 99b92ed47ea64a5cc2cdbebb99b3d006b5283eb4 SHA-256: df4730ca171435f71b51ee09eca0718b6e0360c30b852d840fe9a0f8ede14f5d
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 0.9997

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://jumiwimov.ru/wix?keyword=exersaucer+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/fabetojowuje/ahajQgj/drag_sport_bike_wallpaper_black.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/fiajfd7/nivadugajoxalika.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/ziletubabaw.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/33805624639.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/nonigojoravakopukeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voropa/32695426398.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_0c540229b5ae416da5d76e2411f55746.pdf?index=trueIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/asme_b16._5_2020.pdfIn PDF document text
    • http://feferabi.atwebpages.com/psychological_assessment_specialists_pllc_pocatello_id.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/information_on_aricept_medication.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a31d50a3ebad4e4eaa27cf3146579e6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/1749273508.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/68783718348.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/8th_standard_maths_textbook_solutions_kerala_syllabus.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_8fac5e92111e47bdaaaf445fdf43b9c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/66580475573.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_eb80212d73be45c4a63101e74ba558ac.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_daac33287b904c79a1cb08ed19ee0e3b.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_573c4cbaf84746aa945cbf1c27b37e9b.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_2a2ec9ed2c89417e926bb06b2669975f.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_546230be2e434fb6b8511319fcd1c966.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 5328 bytes
SHA-256: 847a2794df707911bd94b0cb2b7570d4b2ea17a15ff07257b0f66122c817455b
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 10116 bytes
SHA-256: d9960e7ce118436a859fc22bf654a7fcfd056fcd3423cc3ad4ecaeb4a9efef19

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