Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fae001a4ee2312…

MALICIOUS

PDF

136.1 KB Created: 2021-01-15 15:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 84e63c2d5db0c15a7ac1dea2e0aaa61d SHA-1: da85e0eb6470f32226d4c795c577ab21f7093e67 SHA-256: e1fae001a4ee2312a058b1bfbc93cd1928d01e57f3e2f66cfd8a42be49b48690
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM' containing 30 external links. One of these links, 'https://trafffe.ru/123?utm_term=races+of+the+dragon+errata', is flagged as an external URI. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host malicious links.

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://trafffe.ru/123?utm_term=races+of+the+dragon+errata PDF link annotation
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/futaripe.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/fbf157f276d1bb.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/8985579.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/bji9Shb/street_fighter_iv_apk_obb_mod.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/most_anticipated_android_games_2020.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/4622605.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gdcii58/nature_sounds_birds_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/gcBhjji/72818623620.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/rOTnVji/royal_wedding_party_cake_factory_cake_making_games.pdfIn PDF document text
    • https://site-1178112.mozfiles.com/files/1178112/75672848015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/beyond_the_sky_and_the_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/49900422254.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/dremel_circle_cutter_straight_edge_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/wuzaganesuduze.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/viva_video_pro_apk_for_pc.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_off0001cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDE5 5260 bytes
SHA-256: ffec5366d582e96ee84df788cb4027817a4e21c9ee0d9e6fe3706e1ab26e61b7
font_01_sfnt_off0001dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFC3 16924 bytes
SHA-256: c7d283b140ed665439d43fa41bb71afb98a175773fcdecfd56e1deaca5a28ed0

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