Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af0761a1aa923a…

MALICIOUS

PDF

59.8 KB Created: 2021-01-08 14:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0943f24408d3d3b0f50c6177d1899da5 SHA-1: ecd49fa05ac1ea0528b8ac4ada6d0461092555fe SHA-256: 97af0761a1aa923a460a7ea0749e321184a7391c5da8b9b63b7c094f0774cab2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on weebly.com, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://traffine.ru/123?utm_term=dragon+shrine+quests+botw
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/0631bd8b9bf8.pdf
    • https://cdn.sqhk.co/sunalikefazo/ibhagi0/national_geographic_cf700sm_telescope_how_to_use.pdf
    • https://cdn.sqhk.co/vekuperik/zhgHgjd/woody_block_puzzle_battle_online.pdf
    • https://cdn.sqhk.co/jawubibegeba/hijhTyd/walivuwezovuxewu.pdf
    • https://cdn.sqhk.co/dojatejij/H29jbig/radiology_ltd_wilmot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/455559d7-7e41-4540-89f0-6a26e02f5a54/2018_honda_rebel_300_owners_manual.pdf
    • https://s3.amazonaws.com/bidivo/chalte_chalte_movie_song_wapking.pdf
    • https://uploads.strikinglycdn.com/files/3bdce278-06c5-4771-8f7c-5fdf62a8be6a/83399786024.pdf
    • https://s3.amazonaws.com/tudawufed/jitib.pdf
    • https://s3.amazonaws.com/vavale/dialysis_nurse_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/6b814742-2f0a-46dd-b117-9e5b5fa6edbd/28545132656.pdf
    • https://uploads.strikinglycdn.com/files/c01520ba-42da-4116-8351-c6e737232824/gudileluxogapu.pdf
    • https://uploads.strikinglycdn.com/files/ed622f29-51bf-4c15-9312-60ff5833c1cd/91600716744.pdf
    • https://s3.amazonaws.com/fomudebipefasu/xemisuzadokifugatabidabu.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_off0000b141.bin
13dd6869071b6cae01ef033f0b652b01f9566f8cb5ce0a79943a3aae3269a131
pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 5272 bytes
font_01_sfnt_off0000c33c.bin
4a0765f9550b2627a95f6bfbb5fb537db6633b3da5f3840fb0560ed4468f3b0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 9124 bytes