Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c85f2189f6fe5a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f3368952660826a5ac41ba238a3f895 SHA-1: d871488625690b9c748b9dcfc74579b0e6e49a0f SHA-256: e1c85f2189f6fe5ae5b66092b22c5ea318977375a9fbd6a66ef7b3166732f42c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded URL https://jumiwimov.ru/strik?utm_term=what+are+all+the+linking+words is a primary indicator of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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=what+are+all+the+linking+words
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/4301933.pdf
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/1437333.pdf
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/gazidoxu.pdf
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/05ce9f6ca.pdf
    • https://powofowus.weebly.com/uploads/1/3/4/5/134583567/9951678.pdf
    • https://jemaveroker.weebly.com/uploads/1/3/5/3/135391058/gigilukoxujukunu.pdf
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/a6c497ae.pdf
    • http://kidalozexeneni.iblogger.org/90452737455.pdf
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/dejepu.pdf
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/9390705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kasisexa.rf.gd/zapuwub.pdf
    • https://s3.amazonaws.com/liwafo/fizurowijerinojan.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_92277ae1f65348a9a1dc1689775e264d.pdf?index=true
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_ea3e680e47564868859429d252f2bf0c.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_db4f460f497245339279a6044bfb395c.pdf?index=true
    • https://s3.amazonaws.com/zozofufulolig/stihl_ts_420_parts.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_b3d2515517224257a6a74396e5b90d21.pdf?index=true
    • http://xafegewoweli.epizy.com/evening_dress_patterns_free.pdf
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_87f80ed7d0bd4badb782966cef8a063c.pdf?index=true
    • https://s3.amazonaws.com/livivuvuwugeb/27316035271.pdf
    • http://jukujomufo.rf.gd/5286023090.pdf
    • 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_off0000f1f4.bin
513aaa887c03919ec8a4cb8e2526478b553b14f72a9ca089d5963bf2c0f25c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5256 bytes
font_01_sfnt_off000103e3.bin
5c3b2910a3ee7e272cd6c7f550a2d2ff40af5ec80704802b9666b578ed96b5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10572 bytes

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