Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88d7597e331a897…

MALICIOUS

PDF

87.0 KB Created: 2021-01-14 12:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fa2038fa246b4751ec86ad5946ea5654 SHA-1: 97769308af71601a392956cdf5dfda36ae77e380 SHA-256: b88d7597e331a897b75e36d5c1cc4ade1e3b1c961535b25c76df9657acf4bac2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links, and a ClamAV detection for Pdf.Phishing.Trojan. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious or SEO-abused content, aligning with phishing or spamming tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • 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://trafftec.ru/123?utm_term=hey+vsauce+michael+here+roblox+id PDF link annotation
    • https://cdn.sqhk.co/letinumi/GljaMgd/light_it_up_like_dynamite_lyrics_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/8hhget3/85015014381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5fa59f4c8bd27.pdfIn PDF document text
    • https://site-1176615.mozfiles.com/files/1176615/bollywood_dance_songs_2020_youtube.pdfIn PDF document text
    • https://birupilanakok.weebly.com/uploads/1/3/4/0/134017156/44eb719304.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/jXBDjbE/dolitirejerizokukut.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/vjhuhiZ/the_sims_freeplay_cheats_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fb28523e40b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446382/normal_5fdfb3f1b6606.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/oP3gchd/gebusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fe6b151c95f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5feffb1532e85.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/rugujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuses/google_sheet_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/part_time_evening_answering_service_jobs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5512 bytes
SHA-256: 7ceb79b948d77d9ebc9a0e4c74fc8d8f416d59ae931dbd460c3322b3f47cbc7e
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 2504 bytes
SHA-256: 2b4976bd5700831a6739eb7f99079ca960227e63ecdf520b00463d8acf8bf440
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 12208 bytes
SHA-256: 2cf6fa4311630dcca30405458054747d7711c8c2acd573e011a06656f78f24ca
font_03_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 16484 bytes
SHA-256: 70eaa3d80c1d97e289ea2e75dc86337857233aa0058f09613d1286f2a01da3da

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