Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e8291a46d07c5b…

MALICIOUS

PDF

83.2 KB Created: 2021-03-12 21:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 392f5d6bab526a15491ed13f9ac58ecd SHA-1: 9a07f591a7fb42257389ddf51fbafd1129a712aa SHA-256: c0e8291a46d07c5b48f88cc26be4eb6e7b9f05a4bc7bb1d074eb218782159df9
156 Risk Score

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 ML classifier identifying it as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging the document's apparent innocuous content to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=cub+scouts+belt+loops+tracking+sheet
    • http://stavki.link/7753484460009cec.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_603c56158bb50.pdf
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5ff7c031aadb9.pdf
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/fixegik.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fd2bfab202dd.pdf
    • http://dhl-order.info/voneponatekuduwonijojuwotxpt9e.pdf
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/f6f7cd0286800.pdf
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/xudukewis.pdf
    • https://static.s123-cdn-static.com/uploads/4486201/normal_5fedf9bcc1f4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donarepemi/saguxamatedado.pdf
    • https://s3.amazonaws.com/widiku/constitution_usa_episode_2_worksheet_answers.pdf
    • https://s3.amazonaws.com/sorogamat/51084783878.pdf
    • https://s3.amazonaws.com/sezebepit/funny_quotes_from_history_of_the_world_part_1.pdf
    • https://s3.amazonaws.com/xufujofaleki/android_play_store_folder.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_e7fc57105af446a08b26333ec39772d9.pdf?index=true
    • https://s3.amazonaws.com/tubupejevomo/83944168360.pdf
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_c46130d9a2af44da82a4a91c0534681f.pdf?index=true
    • https://s3.amazonaws.com/bupijila/bahubali_2_picture_movie.pdf
    • https://s3.amazonaws.com/ninasivol/79593102206.pdf
    • https://s3.amazonaws.com/wegugus/48587059864.pdf
    • https://s3.amazonaws.com/lakujusitejojet/95308574141.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_off00010a1a.bin
9bae7db4e2cee96826b1b85bbc52518fc9c55cd6c58a915937e68b7b9fd0bce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 5304 bytes
font_01_sfnt_off00011c19.bin
1b4a2343ea4ff4f9e6efa330e9c78d2fdb6ffcea454a26375377610e496fca07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 10348 bytes

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