Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5cdfb1591614e3…

MALICIOUS

PDF

84.8 KB Created: 2021-03-23 00:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60ff3c9b42b693d5874740958cce53d SHA-1: 991bb8cc0ec61bd1ea1e0cad08bf09c6b03b0270 SHA-256: 7e5cdfb1591614e3136f4bfb69bd73f8bdf9964d5978a311ff5b0bd39fe5d867
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 pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://dugedepap.ru/strik?utm_term=how+to+use+texas+instruments+ti-84+plus+graphing+calculator
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/424542.pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_603bf754d7f41.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_602a0aebabb32.pdf
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/toropimap-vesugigotikurak.pdf
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/8119377.pdf
    • https://cdn-cms.f-static.net/uploads/4486351/normal_60517b55892bb.pdf
    • https://cdn-cms.f-static.net/uploads/4462726/normal_600bfbb3278c8.pdf
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/9582489.pdf
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5ffac1b75d814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_958340a198fa41f5accbf7f47956a993.pdf?index=true
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_4cc83cfb54b94674ab48b69a7dd770e0.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_55d84f709aab4b8dac17660ff23643e0.pdf?index=true
    • http://nozumipoz.epizy.com/jipawagosetik.pdf
    • http://golizewojavizav.epizy.com/how_to_convert_word_document_to_on_mac.pdf
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_ef4c8aee6df24fe68f1cf7278c8948fb.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_cee86aab57164e44b7fc69852e6c59bc.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_4207def816f34a97a81964578224c292.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_030abe7cf5524421ad3db668f5dd5ef2.pdf?index=true
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_16c4f756f4b6463395713d93357a2904.pdf?index=true
    • http://didefiwofiko.rf.gd/jizuturaned.pdf
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_d051476014d24618beacc04c09ccd543.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_e6e10013ed364b16aad51155fb7110f7.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_59b0e5c020184163bbc860db0a7024d9.pdf?index=true
    • http://pikuvideposem.epizy.com/1483813600.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_cc72c60c215d4026acb01bc9bda3849e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ca.bin
96b30f7d282a7d9940d9772dc8607840767fa195e270fbfd8fe8501055941f67
pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 5784 bytes
font_01_sfnt_off00011d73.bin
2d1b7061e6cec675de8b440a037bfd3b66de70859623cc818b8586103e443da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 11692 bytes