Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb6a08a320f5aaa…

MALICIOUS

PDF

75.8 KB Created: 2021-06-20 16:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd6812d159d227227e51f5af7813d614 SHA-1: 2c80d8ea61154045b4d8f78c8baaa5abde396f33 SHA-256: cfb6a08a320f5aaae1c837fd5bd63549a9e3ae4aaedbd665645220642678a840
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external PDF files, some of which are hosted on disposable domains and utilize UTM parameters for tracking. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for information, likely through a multi-stage download process.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://static.s123-cdn-static.com/uploads/4368222/normal_6009769fb4538.pdf
    • https://cdn-cms.f-static.net/uploads/4459329/normal_602904235817f.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_60c409e15ffd6.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fe98c600a5e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/sq/ugae/~3/aauXj3bnHUA/square?utm_term=words+of+radiance+epub+download
    • http://gaguwufajij.pbworks.com/w/file/fetch/145116915/pebadezozidunelufu.pdf
    • http://didaneguk.pbworks.com/w/file/fetch/144741003/diniregijoledebenivasuk.pdf
    • http://gopidam.pbworks.com/f/will_pan_net_worth.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c3c73cf687436e7f9168d6/1623443260985/wiwisejurol.pdf
    • http://pafesudive.pbworks.com/f/dutagikoje.pdf
    • https://uploads.strikinglycdn.com/files/e5920c4a-a272-4927-8d61-a3aecfd4ea7d/tuwawinuzoganebenafes.pdf
    • http://dawijunegolo.pbworks.com/w/file/fetch/144422589/wugudomexerafesedekenusu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60cccb7ca850a767f7abfdc4/1624034173119/labimeguwudo.pdf
    • http://rutarotovez.pbworks.com/f/guneretumanesufe.pdf
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144725886/what_is_the_oxidation_state_of_cl_in_hclo2_apex.pdf
    • https://uploads.strikinglycdn.com/files/ff1018c1-9244-4c7c-8a2f-6163b48e2af1/12275808982.pdf
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144653226/hp_designjet_500_42_driver_windows_10_64_bit.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60c879ed3bfe6c1d0f7dd850/1623751150638/santa_monica_skatepark.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144700854/63263945919.pdf
    • https://uploads.strikinglycdn.com/files/bf4e4c41-dfc7-4b9e-8627-5c9da30a527b/62663477654.pdf
    • https://uploads.strikinglycdn.com/files/b869c458-0c57-49bc-b0fe-c5e03b144ced/sexakefi.pdf
    • http://ronejoxerer.pbworks.com/f/nojebitemagu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd67.bin
d0393f6ab302cf62926dc1dfc369b6ef6069ea303671decd70aaaf44e5675e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 5196 bytes
font_01_sfnt_off0000ef2b.bin
b3b47638d02601b9b23bd3ef4757b1647e0a7ee298e51fe93551dacb19562e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10700 bytes
font_02_sfnt_off000113d2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 4324 bytes

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