Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9b959ceaba825…

MALICIOUS

PDF

67.7 KB Created: 2021-01-06 09:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c5d1f792a370e10ebb2fbe1ab5f275 SHA-1: d1265ad4668d3601cefa5d1f2883d9cd802384ba SHA-256: 28d9b959ceaba825afcd1aabe135d6db6d23eb44328dedd9d7a4874b0ccc16c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or traffic-generation scheme. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of external URLs point towards a phishing or malicious redirection attack, likely initiated via a spearphishing attachment.

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://trafficel.ru/aws?utm_term=all+of+me+the+voice+performance
    • https://cdn.sqhk.co/sezogitov/gheKgcK/vozesugefasegeki.pdf
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/964167726e.pdf
    • https://cdn.sqhk.co/fofasafiwi/e8gg6UR/phoenix_suns_players_all_time.pdf
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/zozobuwo_gutetirabaruja.pdf
    • https://cdn.sqhk.co/kagelemovo/hg6UgeA/dreamer_lyrics_martin_garrix.pdf
    • https://cdn.sqhk.co/lojiwoxaz/dicwgdh/90600596778.pdf
    • https://vizupadugixodu.weebly.com/uploads/1/3/0/8/130813134/f563f88d7d94.pdf
    • https://cdn.sqhk.co/xufaribo/w4ngfXb/pokemon_showdown_team_builder_download.pdf
    • https://cdn.sqhk.co/dufadafakuti/hfuhf5r/golden_farm_idle_farming_adventure_game_mod_apk.pdf
    • https://cdn.sqhk.co/boxokozofe/heNjiZw/video_meme_creator_app_for_pc.pdf
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/8613290.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ab19d16-ff8a-458a-b370-5c6acae65747/25215099653.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_off0000ca39.bin
4624479275c4b539f6d981222d376f85f3aa48a344d19e0c6e3f4daf56489ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 5124 bytes
font_01_sfnt_off0000db89.bin
ec816934cc4838b7e7ae566dac576cc47fb2d892505fd47e3900023b1a3087bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 10908 bytes