Malicious PDF — malware analysis report

Static analysis result for SHA-256 edab1762c5ec3ab3…

MALICIOUS

PDF

69.8 KB Created: 2021-02-24 15:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9db94addd5a81c86e5fd64cd2e9dd02 SHA-1: 0e264c6e93a1d7205b291ff856a79844f612d537 SHA-256: edab1762c5ec3ab306554c801691a2f28fdfaad0fc22dbc1c84532f322de2947
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 by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the PDF structure point towards it being used to distribute or link to other malicious content, potentially as part of a phishing campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=shaman+classic+talent+build
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/dejemis-fedus.pdf
    • https://cdn-cms.f-static.net/uploads/4389361/normal_6025cd49cb4a4.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fd91b6a3b68f.pdf
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5fcacba1420fe.pdf
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fec01199c2d8.pdf
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/b7f612c5cfb835.pdf
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/4873897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rixevozajixezos/centre_de_formation_aftral_paris.pdf
    • https://s3.amazonaws.com/xipavir/heroes_of_hammerwatch_build_guide.pdf
    • https://s3.amazonaws.com/xebuvuwov/dasos.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/bubble_bobble_hero_2_pc_game.pdf
    • http://kosejoviwo.epizy.com/fumug.pdf
    • http://pinogizege.rf.gd/96518628565.pdf
    • https://s3.amazonaws.com/seriposuj/mcgraw_hill_connect_answers_macroeconomics.pdf
    • https://s3.amazonaws.com/midaguvimabof/bangla_dictionary_innovative-_software_apk.pdf
    • http://zedovapovakodev.rf.gd/sevixup.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_off0000d150.bin
a01ac39497215712e927e0f323bbcd52b59e1b3a1ae7a65068d1447c69986264
pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 5328 bytes
font_01_sfnt_off0000e343.bin
5f463a6838490e621b18cacb7153bbdf5045e34df0ac62a8e39d8bc51317f5d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 11236 bytes