Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba478ffa30ec1b43…

MALICIOUS

PDF

141.4 KB Created: 2021-05-19 06:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2a978bbedd71fbdee9b6335e2804380f SHA-1: 516b555fa8d7ce9cf7c18b8ea9f4ce2ebd9b254a SHA-256: ba478ffa30ec1b430ea236553bf63ba928406c2232cb898ab431d663bd7e02af
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to benign-looking documents, but one prominent URL leads to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+reset+accenta+alarm+after+power+cut PDF link annotation
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/8106617.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/simuwu_zewotuxevi_gomixamenibasuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fec0af1adbf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_6003d9178d43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_60400d53013bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6063bcd08141f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zijivevip/what_does_chinese_character_ting_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/16576078069.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/rulizijiwupoporavesube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63760dbd-5cac-43ff-b7f7-b6c53f8da28c/48642826108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2dd92b4-28be-440e-9459-26fa9815fa15/35964998383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d784685-9961-4b12-84c0-ec64f37c6155/is_boston_market_open_christmas_day.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/adobe_flash_cs3_free_download_full_version_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/how_to_fix_a_ridgid_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae53a646-0a2f-490c-9dc6-b8d1b04ec219/78305156968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259faae2-fc9a-4b9c-8d71-4d6950b98ebd/how_to_rotate_view_in_autocad_without_changing_ucs.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/bibexakakirezopexifan.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/jamejibazesunaxukufomiwud.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/1042125795.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E091 5048 bytes
SHA-256: 1a16f551e74bc74d3efeeae77a3e875b8bf898596b822f277564e0cb418b6c6d
font_01_sfnt_off0001f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B3 11808 bytes
SHA-256: 899df0c7bab1f52cf917a34b3c0ab8a13ba2a6152ceb51a6ffd61aec3a65e7de
font_02_sfnt_off000219cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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