Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac8e80e1567ddb3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 21:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9a09995ddc4f5ad8a4075af48e9b46 SHA-1: d5c5298a438360ad6f38d673a5a3366ed1e8bf30 SHA-256: 8ac8e80e1567ddb395ca4dba7aec105d8262b9586aee2d19371e050e3860135a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URL 'https://xezojet.ru/award?keyword=headway+elementary+book+pdf' is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=headway+elementary+book+pdf
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/fupamixiz.pdf
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/tewizerezina-vubobarawe-zeviwakax.pdf
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/4757c5f434fe3.pdf
    • https://cdn.sqhk.co/mudebijutene/bide5jd/forge_ahead_definition.pdf
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/7400030.pdf
    • https://cdn.sqhk.co/bimowikosaru/ggTjagf/evoland_1_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7c38214263864c7a8d92805256f5f5ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/502f4068-005b-4960-ba3e-45bf2c9b6e5f/scott_pilgrim_comic_color_download.pdf
    • https://uploads.strikinglycdn.com/files/83c92a47-123f-4735-8876-a8c981fd5732/whats_the_best_turkey_fryer_to_buy.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_e78ccc3eb53a489693a9f7329d8545b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3126d356-abe4-4583-815b-48ad5fa19755/94645004346.pdf
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_5531f02f76eb4015b668d63e3cf431f7.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_3bd8412cf50d4dc19e08fd7cd46da4fb.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2d09d7c173ee4047adae864802fa2404.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_56ecb7b048f44bf5b378de9d64730c4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/62bab4c9-5b79-4402-95e5-0b9e183aee71/kufiw.pdf
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_60a3c6854941455a81d84f01197cc586.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6b6d49b-537d-4547-835a-541eaa26d216/73094808799.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_off0000e920.bin
0017b2261e072011c28720e7e82a6de4ed0c939045b453ff59e4a01dcfc42690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 5368 bytes
font_01_sfnt_off0000fb5f.bin
6712621833f36e93fbe104109107581f2621af714fa8b2c866bd7aaac0f31d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 15272 bytes

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