Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefaca3d21279e3a…

MALICIOUS

PDF

78.3 KB Created: 2021-05-07 00:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 80b35f67dc93f109b4c1c819d2e8c39a SHA-1: fd28dd0c5b70f0eeb2c960f3929476e36b7f8ca6 SHA-256: cefaca3d21279e3aba2960bb16e289fa82363230b31c809644be05b520473851
186 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 0.9997

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://nipisod.ru/strik?utm_term=will+there+be+a+firefly+reboot PDF link annotation
    • https://gewolokumopez.weebly.com/uploads/1/3/0/8/130814623/pezabiga.pdfIn PDF document text
    • http://hangookoil.ru/why_is_my_hamilton_beach_coffee_maker_leaking_from_the_bottom2nokn.pdfIn PDF document text
    • http://haifaiv.ru/66435861576t23r2.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/457004.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/6239684.pdfIn PDF document text
    • http://muzoc.xyz/how_to_drain_a_haier_chest_freezer4sp7e.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/9418253.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/6269f7af9fe.pdfIn PDF document text
    • http://esplus.pro/3692333570204lnm.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/zifeterove.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/zepij.pdfIn PDF document text
    • https://lovasevetoxe.weebly.com/uploads/1/3/4/4/134445156/2258856.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/7838727.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/d44abc11-232f-4b8b-bbff-7bdb1591d760/29910318325.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_0a4f59ed51a743659b5617fe3368b7a5.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_1daed5196e7449c48b3bb1e5bbc7d42d.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_3dd1ced1e23147e08e9f3e2886ddd6e8.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_13b10e87c8264702845dab9c89a3020d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df906be8-0e58-4b2c-b878-8bf6cd3e3ac8/canon_rebel_t5_price_philippines.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_08f924f558ea42db869622ac7b1f35a3.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_626f185daba245e9b759025c6814ca8d.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 4932 bytes
SHA-256: d73ab8f30f73b42f5334608f1c30ff9ab62b735f0163c8f951e1519e41624b85
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11188 bytes
SHA-256: c67ebf673763a62309961a587fb6a87d38d01bd59ecf07c1d4ebbcbb15672b55

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