Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f129bf2ba54c39…

MALICIOUS

PDF

76.8 KB Created: 2021-05-31 00:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff35320582e7175da570339670be4fe6 SHA-1: 11c3de4c27741eda5805bf938202875ae734a33d SHA-256: b8f129bf2ba54c39a27937c85a95d0da3e48e84ae14ae072f1672148b9c0c836
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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/strik?utm_term=reproductive+system+definition+simple PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5ffc4aa99d18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_604f3b4a6489d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_604a899b9a90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5fdfd3c6a667f.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/xumugowenunesux_mojevakewulut.pdfIn PDF document text
    • https://xirugavo.weebly.com/uploads/1/3/4/3/134337246/kuvusogononimid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fc8e84dd58e4.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/2715635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_602174a664183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_60532375a6719.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/1622881.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/d49b6158-dd39-4876-a2b4-369ee2f8aab3/kenmore_gas_stove_wont_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc01e3e-208f-405b-a134-51ff384d7217/patuxopuvomadamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c52d454-6193-4f23-a35d-454808097275/nelsons_ministers_manual_nkjv_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17a4a6b-8242-4b7b-b694-03b2763ad3f2/38839728476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d52da2-97e1-44a1-a688-038adc93399b/mystery_of_capital_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569e4fc6-4cea-4e21-9c58-4d6afdb95354/bofefojozibezinisunarux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93113434-8927-418e-b27e-fdf1339e9e69/vaxenopufitede.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 5140 bytes
SHA-256: 741fba8029e8740496c0a684a3a7c2856ee0543dc09eeeacb411b1d7c237a284
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10152 bytes
SHA-256: bd7041d921be2832d113c50b3267172297fbaddeaef6cb71a27543c3fa40aab9
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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