Malicious PDF — malware analysis report

Static analysis result for SHA-256 755b38588b505bf3…

MALICIOUS

PDF

77.7 KB Created: 2021-05-23 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86f603c9c5422a8f6f876ec508a4ad8 SHA-1: a476f672ed8ec4f24e23900148a74792488eb124 SHA-256: 755b38588b505bf32059d3696066cba4a3ed726cb104828335aade1e9a5a11a3
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 phishing or malicious intent. It contains a large number of external links, suggesting a link farm or a phishing campaign designed to redirect users to potentially harmful websites. The embedded URLs and the PDF structure strongly suggest this is a malicious document, likely delivered as a spearphishing attachment.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=how+often+to+wash+mattress+protectors
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60518c53b9189.pdf
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/rigufewaxusu-raken-mawimogurunowa.pdf
    • https://cdn-cms.f-static.net/uploads/4389571/normal_601876e075332.pdf
    • https://static.s123-cdn-static.com/uploads/4449614/normal_5fe1190820a3b.pdf
    • https://static.s123-cdn-static.com/uploads/4483604/normal_6002fc28bf851.pdf
    • https://cdn-cms.f-static.net/uploads/4477409/normal_6033c4c40a3eb.pdf
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fe2b08ae6c0c.pdf
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde7eccb53c3.pdf
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ff80c600cdd4.pdf
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/43e2d15738d.pdf
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcc16539fad1.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_603f80c47598c.pdf
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/vuvujopebi_vunililisit_faruxusevefuza_jepusamimuvo.pdf
    • https://cdn-cms.f-static.net/uploads/4418970/normal_603acfe769166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pazerogasarinu/rokifamunu.pdf
    • https://uploads.strikinglycdn.com/files/1af780f2-c5e6-4e42-b9bc-8419d2318e02/fisher_wood_stove_for_sale_on_craigslist.pdf
    • https://uploads.strikinglycdn.com/files/9bbcbc54-eed9-4fa7-833a-f0ee17892f10/ariens_path_pro_carburetor_cleaning.pdf
    • https://s3.amazonaws.com/debiwelof/peer_gynt_suite_in_the_hall_of_the_mountain_king.pdf
    • https://uploads.strikinglycdn.com/files/e3d7f590-e4d9-4b05-9e20-47210d49fea8/god_is_able_hillsong_chords.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e332.bin
3764fe0474ceda4e55d99ff354c457c51b51ec177cb769d3014c53ba9e234a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 5016 bytes
font_01_sfnt_off0000f415.bin
7818dd2b071c4ae968dfa2c996c82dda076bedcb897e95751a72e3d562881a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 11008 bytes
font_02_sfnt_off0001197d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 4324 bytes

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