Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd59a9de695037ea…

MALICIOUS

PDF

76.4 KB Created: 2021-04-09 00:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ab860f8d28d9ed34b6312b18a46061 SHA-1: e194ba9e9758eef41a38f234e82e5dda08879428 SHA-256: cd59a9de695037eacf26547d11cd1e4690c282a9ffcb4dfa5e3d3e1abc18fdcd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to 'https://dafemum.ru/strik?utm_term=my+cloud+apple', suggesting a phishing or scam lure. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of external links, typical of link farms used to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=my+cloud+apple
    • https://cdn-cms.f-static.net/uploads/4376629/normal_605c007f33846.pdf
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60280320813d8.pdf
    • http://pivowave.iblogger.org/mimuniwodokiwutar.pdf
    • http://jukomanafow.22web.org/91910584692.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/9278255.pdf
    • https://cdn-cms.f-static.net/uploads/4485308/normal_604ecc883152c.pdf
    • https://memozarukun.weebly.com/uploads/1/3/4/3/134378051/6ea1145c0292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nexisaxilesa.rf.gd/70367101224.pdf
    • https://s3.amazonaws.com/fujadabez/horizon_zero_dawn_trophies_guide.pdf
    • https://s3.amazonaws.com/wipotegadodorek/76835376851.pdf
    • http://varosuvavim.epizy.com/kuriwosopusifota.pdf
    • https://uploads.strikinglycdn.com/files/850883f1-0c6c-4739-a2da-52e022fc2aca/how_much_do_engineers_make_in_utah.pdf
    • https://uploads.strikinglycdn.com/files/cf72f3ac-9a9f-4b50-85f0-052632343cc5/dowoforuzizilineros.pdf
    • https://s3.amazonaws.com/veraxawewib/89399127826.pdf
    • https://s3.amazonaws.com/nunakixuma/66955106226.pdf
    • https://s3.amazonaws.com/tiniruru/nordvpn_android_tv_netflix.pdf
    • https://s3.amazonaws.com/tiniruru/30503510210.pdf
    • https://s3.amazonaws.com/rovuweraja/mifomijilonaridipu.pdf
    • http://mesesoriran.epizy.com/zozizoxitamibidadaj.pdf
    • https://s3.amazonaws.com/zafijukopa/baby_pic_hd.pdf
    • https://s3.amazonaws.com/kewakuko/brviaire_catholique_apk.pdf
    • https://uploads.strikinglycdn.com/files/8bfd7ff5-5682-4fd2-9aaf-398f477946e9/sekimumibesob.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_off0000ec86.bin
b6c716be475bc5b3fffdc60539cf805ff62237715a4cc98cf5ea330e11f73876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 4900 bytes
font_01_sfnt_off0000fd5c.bin
949bfd3bd08cae1bd7dcce09d414835bb1fff2775932c000df9c1658281a81da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11436 bytes

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