Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b2730ec3994cd…

MALICIOUS

PDF

100.8 KB Created: 2021-05-15 01:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6749ccf718d62e6c844fef40582c72b SHA-1: df75f0eba47f1ca48d02e0e564aecef1ef9134d2 SHA-256: b15b2730ec3994cdbb83996e214e3419cc5e68396f202450cd816105cc7e58c6
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 0.9995

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://mezovuduw.ru/strik?utm_term=how+to+change+flame+sensor+on+trane+furnace PDF link annotation
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/vexenugub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6055073c68ad4.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/pixegisubapiz_tukakax_fupawubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_6002052811c26.pdfIn PDF document text
    • http://supernefritroller.xyz/4019397825312c30.pdfIn PDF document text
    • http://tumbochka.space/transfer_dvr_recordings_to_external_hard_driveq68bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_600a51c87f41e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501501/normal_5ff309a99b3be.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/zogodekafipas-tulera.pdfIn PDF document text
    • http://unlockdeals.shop/apple_airport_time_capsule_hard_drive_replacement8krai.pdfIn PDF document text
    • http://copyrightproblem.com/kapufepates57fq2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_587e169c9a1e421bbdc92fba289358cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/kenaxolubosivenawaluzex.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_2eb3decb0888461ab8bdf343772a7c33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/free_guided_meditation_for_stress_and_anxiety.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_0e3dc95ddfcd492ab5c51e850c710b7c.pdf?index=trueIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_43384c55b0874f78909a7a65bb155ad9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/gemaxaji.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_4d0942e376ab471ba632d3b6a572eedd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/target_scholarships_for_field_trips.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_a48601cf8ae74ad0b69bae57d551d03f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/taxejaverupimi.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_9bc2f8307ac14df08922cc4dec0d12a1.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_3c96f7b8517f4c8bbe75d714969d2c55.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_bf54aafcc7984dacb988d7a37d6dd8e4.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_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 5348 bytes
SHA-256: a2adab5d665d2091e4de7428b8d8fb660345dab628ee232c4b4bf47cfd151b80
font_01_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 12148 bytes
SHA-256: 2919126633dbe7354afa9de9b9a44e6a481bfa28950cd61df1e9ee25414a946c