Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b95e74b655b177…

MALICIOUS

PDF

104.3 KB Created: 2021-04-04 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bba8241f625b8b393ffa1a35c25c7b4 SHA-1: bb962e4ff6ed89c92dab943e9e8c4eee7587a921 SHA-256: b3b95e74b655b1775a6461cbcc1774986e60301754773f8448f1f40f2c757b75
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Antivirus Bypass

The PDF contains numerous external links, with one heuristic specifically identifying a link farm designed for SEO manipulation. The document also contains an instruction to disable security software, a common tactic for malware. ClamAV detection and ML classification strongly indicate malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ch-data-2a8fv9s.pw/125174327233q7x6.pdf
    • http://onlinetiser.website/zenwise_digestive_enzymes_walmartpwl9r.pdf
    • http://natorg.fun/90437727190be08f.pdf
    • http://blancop.xyz/adguard_premium_apk_final4zse9.pdf
    • http://goproonly.com/seedfolks_book_trailer3nue8.pdf
    • http://pubguckazan.com/star_wars_saga_character_sheet_fillable0wu2r.pdf
    • http://voztrans.ru/great_unclean_one_datasheetmvuvv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=download%20film%20the%20maze%20runner%201%20sub%20indo%20480p
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_aec60eced54d4aa2a34e61bf203f2a86.pdf?index=true
    • https://s3.amazonaws.com/latufenaw/altair_inspire_2018.pdf
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_5621719ca70140f9a147343527ea1dc8.pdf?index=true
    • https://s3.amazonaws.com/tetenifeme/what_is_the_reid_interview_technique.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_9f9ed9a7cf3649ae83d6c7aab934d51e.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_4b5993a10bf94581bc2247faa8bf3c0f.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/vederofoxo.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_574e3d8bd3d0493ab4a736dbabbace8c.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_043c0f848dbe478c8fa3d5f90311a5a1.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/87307917199.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_f4c01022a1f64bed9e74858690d6cc58.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140c4.bin
4e8ab03e8f58982f25df063551ec9bca5e3c1a704c90d495e42fc10baeafd76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 6040 bytes
font_01_sfnt_off0001554c.bin
f71718f43d33cd65484b06945f0e9e945734b1bbaefd57a3d51cfe4c7d99bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 11888 bytes
font_02_sfnt_off00017dfa.bin
a79673c45bca31144ddacc4b3ece782595bdeb2f2765ebdd0c54287bc80b2fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFA 16332 bytes

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