Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee66867f974b66c…

MALICIOUS

PDF

80.5 KB Created: 2021-05-24 00:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b749eaa6f4202f3e6b3e5254d972ed7b SHA-1: 6ffe7322e9b95c8ed274a235c301cdf489499cb5 SHA-256: dee66867f974b66c4a2c7600ddeb03722de3e108874b5c9036a6934123f40f70
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a search query, likely intended to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=does+guitar+hero+live+work+on+xbox+one+x
    • https://cdn-cms.f-static.net/uploads/4473971/normal_5fd0a44c165ba.pdf
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ff226a716e82.pdf
    • https://static.s123-cdn-static.com/uploads/4405419/normal_60010e6693a05.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600d53fa33154.pdf
    • https://static.s123-cdn-static.com/uploads/4476580/normal_600103cd0561b.pdf
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ff763fb36318.pdf
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6065568fd1692.pdf
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/4f91475d1533.pdf
    • https://cdn-cms.f-static.net/uploads/4464739/normal_604b0cd75783c.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_600f4b7d5a711.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6011fb5fa0e44.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_605005029186e.pdf
    • https://cdn-cms.f-static.net/uploads/4415936/normal_606ae5f18dc1a.pdf
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/8962d.pdf
    • https://cdn-cms.f-static.net/uploads/4392860/normal_60530ff343861.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sefiwegegagu/rujowadetomawawatod.pdf
    • https://s3.amazonaws.com/tevomenil/how_to_replace_ink_cartridge_on_hp_officejet_6700_premium.pdf
    • https://s3.amazonaws.com/wefadep/53449814218.pdf
    • https://s3.amazonaws.com/wovitiku/gekukesugowelibozuvon.pdf
    • https://s3.amazonaws.com/fidefofudi/chidinma_love_video.pdf
    • https://s3.amazonaws.com/sinadi/bobebepodawusesed.pdf
    • https://s3.amazonaws.com/wolina/49692052491.pdf
    • https://s3.amazonaws.com/rowubunak/51754347033.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_off0000ef3e.bin
8262568ed83186a818cb22e5d12e001906a101dd5f0639e9b3d973fcab7dfe92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 5252 bytes
font_01_sfnt_off0001012d.bin
8b2a383fdfd02c0cafcc61d3e5a9dfc9d8151342c5a5dbf66f086497e4f5027c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10720 bytes
font_02_sfnt_off000125b5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 4324 bytes

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