Malicious PDF — malware analysis report

Static analysis result for SHA-256 8825af15e0654405…

MALICIOUS

PDF

65.6 KB Created: 2020-11-11 02:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b610df24f81f08f8f6adc50f880f901 SHA-1: 82e30aa68313ca9f06767b2884b295e7c54759ca SHA-256: 8825af15e06544053a536da15708a899756fad46f675788bfaffc2a467032274
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a common technique for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of numerous links, including one pointing to a potential APK download, suggests an attempt to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?keyword=cover+letter+examples+for+grant
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/9e192e33eb4f5a.pdf
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/dunurileti.pdf
    • https://vorabatuzawudun.weebly.com/uploads/1/3/4/5/134582038/1607442.pdf
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/bejinu-fopav-xefoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ravuxudibure/hill_climb_2_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/14546ad4-17f7-4f62-bed2-b20cfe1ede4d/58511541384.pdf
    • https://s3.amazonaws.com/roware/69721991585.pdf
    • https://uploads.strikinglycdn.com/files/34b17123-f20d-4e2e-9606-6b80a1f077d6/18486849894.pdf
    • https://s3.amazonaws.com/sezutuma/cladograms_worksheet_answers.pdf
    • https://s3.amazonaws.com/wemupajese/big_head_hockey_unblocked_arcade.pdf
    • https://uploads.strikinglycdn.com/files/50076bc4-b349-48b6-b1e1-da370628513a/13715035392.pdf
    • https://s3.amazonaws.com/xefejevife/new_deal_essay_conclusion.pdf
    • https://uploads.strikinglycdn.com/files/7c11e523-60c2-418e-8fa7-e4b1229b99fc/redox_practice_worksheet_answers.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_off0000c57d.bin
1274dfedec75f73426d1215d0f6b45042d14e65b7150d89288d443f535a274b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 5252 bytes
font_01_sfnt_off0000d74e.bin
a2a8baab6ce047e090ec6ad84bc7dfbd3eac370d66b4cda820de89bb71610f9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10248 bytes