Malicious PDF — malware analysis report

Static analysis result for SHA-256 79274d4d8320b9cc…

MALICIOUS

PDF

82.9 KB Created: 2021-05-30 05:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 873b6ba449e58b09a3e93f42d4726c29 SHA-1: 0a75973b702276669f3c3eefffc41131c97c1018 SHA-256: 79274d4d8320b9ccf48a8d8de43a7fbecb5dca2462e30a3f054ca904aa2c519e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content.

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://maypoin.ru/strik?utm_term=what+is+apple%2527s+organisational+structure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404113/normal_606c37f48dbfe.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/zizegutiz.pdfIn PDF document text
    • https://xerotopofuwega.weebly.com/uploads/1/3/1/4/131406930/tenodanopekamedipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_6028260be0f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_6011678b877b6.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/wewuvowokepos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd679dd07aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_604ccdf16926d.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/7361913.pdfIn PDF document text
    • https://renenanap.weebly.com/uploads/1/3/4/6/134666424/vavesiw_menixis.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/pujozelijinolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_60214dae1ba1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_6022c0f215983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_6038792f2e946.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/3a485b6e-d147-4476-8104-1a0d00bc7fec/why_is_kalki_coming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d87382f-4f39-4a65-b1a5-7cf4e80b8e94/how_to_reset_a_roku_with_the_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53dbfe62-259b-420c-9308-09b2aa5eb399/imo_video_call_recording_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4655f43-9cb8-492a-aef4-532cf23c01e5/wadokixulizekugizag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f3e26c-6bbc-4d11-a097-173029692dc8/how_long_do_i_have_to_return_something_to_academy_sports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6fa30a3-a440-452a-bf4b-548a51bbda82/lomozezurofoto.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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 5124 bytes
SHA-256: c53a6a29631403acea86cd016aa1ae662ce9542a55aa01a337784aa33ed58e6b
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10896 bytes
SHA-256: ad0a5adc6eb378966d4ec3e1ba30f0e2453362e28652d945be252e093244b8d4
font_02_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3