Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0fedcd6a69bc5e…

MALICIOUS

PDF

65.6 KB Created: 2020-11-14 15:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a592d2c295705461e572e92821d13616 SHA-1: 1ff658e8db28e4946b8464b68536fc289687a947 SHA-256: ff0fedcd6a69bc5eade64d83a0cfefa471f22646f341d45c262d0effc6f3e49b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to attract traffic. One prominent URL, 'https://traffnew.ru/strik?utm_term=mera+yaar+dildar+bada+sona+mp3+downl', suggests a lure related to MP3 downloads. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS', along with ClamAV detection, strongly indicates malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/strik?utm_term=mera+yaar+dildar+bada+sona+mp3+downl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f89bc9bc7557.pdfIn PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/1771281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e342fc05-97d5-4b2b-8176-d7a27904d05e/59474754251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7957aa-252e-4447-9d7d-91149e586cab/diablo_3_strategy_guide_free_dow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d167d137-dda5-4cbd-bf04-d85bd6d77281/fomaveb.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/bunny_head_basketball_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/kisejalutazutexupezuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/pokemon_x_randomizer_citra.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/gipikurolino.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/character_study_of_moses.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC165 5608 bytes
SHA-256: 3869e5eeac6aa3602fa95ff75272b34a6731661d96cd9a1a6cf2e439ff45f137
font_01_sfnt_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 11284 bytes
SHA-256: b95501597f4134f2695917a774ef56e32e0a8dc93fcdef7311eec09bcf221e31