Malicious PDF — malware analysis report

Static analysis result for SHA-256 682ac95fa6b27a40…

MALICIOUS

PDF

78.1 KB Created: 2021-05-22 14:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fc5ced60d7c216180cc115cc10c9e91 SHA-1: 200d906dae4186fd5da56cefce80fda9e1f7b8e2 SHA-256: 682ac95fa6b27a40a903f810ccca2da02de2da09fc4f3dfcf291937e6e36b7a6
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm or phishing lure, as indicated by the PDF_SEO_LINK_FARM heuristic and the presence of numerous external URLs. The document body, though heavily obfuscated, appears to be related to 'balancing chemical equations', a common pretext for such lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=balanceo+de+ecuaciones+por+metodo+algebraico+ejercicios
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/jekawajavu_libegedanediwa_jasexixed.pdf
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/46e43900826bc42.pdf
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/6f823ed29c2bf3.pdf
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/bc317aa.pdf
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/1192579.pdf
    • https://cdn-cms.f-static.net/uploads/4495837/normal_606c911b90d1c.pdf
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/b26c44bb94a.pdf
    • https://cdn-cms.f-static.net/uploads/4418587/normal_603e6ed1e2a1d.pdf
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/roxazozal.pdf
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/rugivofunebes-zowebipur-pugeroxuwifo-wipunamedupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d2bfb41-9c56-4281-b0fd-aeb5f9aa5258/kumadi.pdf
    • https://s3.amazonaws.com/jigezilor/52502108052.pdf
    • https://uploads.strikinglycdn.com/files/441d9f38-014a-4fd6-bece-3b79eceef546/xalepiv.pdf
    • https://uploads.strikinglycdn.com/files/5c1448a9-0028-437e-94a4-c9345b72f5af/wall_street_journal_prime_rate.pdf
    • https://uploads.strikinglycdn.com/files/52005f27-6057-4975-9d09-86593fe514ed/91339045600.pdf
    • https://uploads.strikinglycdn.com/files/3594eee5-ca5f-47f3-8a5b-5aed43a1c37b/which_supreme_court_case_established_the_fruit_of_the_poisonous_tree_doctrine.pdf
    • https://s3.amazonaws.com/wixanarer/34899142300.pdf
    • https://uploads.strikinglycdn.com/files/0fb9ec2a-86b3-4db5-955d-b4145971af41/mitsubishi_car_air_conditioning_problems.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/37560369212.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/walametetojetiriduginu.pdf
    • https://uploads.strikinglycdn.com/files/54359e66-bb95-44f2-a1db-b8a8c382c4f9/8330808276.pdf
    • https://uploads.strikinglycdn.com/files/c80e157b-43c4-4925-bf8d-e73dc574e6aa/political_science_and_international_relations_books_for_upsc_in_hindi.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
    • 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_off0000da76.bin
c1dc6b1c44eb5a44bea613e651b087835f6ba524d9eaca4f96852c2f88718355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 5656 bytes
font_01_sfnt_off0000ed97.bin
3a63e648dd4bb1a1d73cb7b39e2de282335f450f3b2b3336a4cbcd08def9efab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 12180 bytes
font_02_sfnt_off00011597.bin
b45438f745c5918714ea576d273ce1d7356fc997d96b74ccd096a7d3796c26ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 16108 bytes

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