Malicious PDF — malware analysis report

Static analysis result for SHA-256 994699bd930cc002…

MALICIOUS

PDF

78.3 KB Created: 2021-04-11 11:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b41f43626dac450158b2e15c2d6b3f SHA-1: 685570aafe313ce4d70dd0b67dfa32871dd73cde SHA-256: 994699bd930cc002439f427f3b6325280df1eb4781058913f24381cd816e7944
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to a 'passport ultra 1tb' issue, which is likely a lure. The presence of numerous external links, including one to 'pelibifir.ru', suggests an attempt to redirect users to malicious websites for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or downloader attack.

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://pelibifir.ru/strik?utm_term=my+passport+ultra+1tb+won%2527t+show+up
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fdce03abc1fc.pdf
    • https://cdn-cms.f-static.net/uploads/4447273/normal_5fdb000e1ce53.pdf
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5fd2a4f2bfc65.pdf
    • http://pagixuzipalopa.iblogger.org/lubusozoduwatovuritevif.pdf
    • https://cdn-cms.f-static.net/uploads/4490735/normal_5fe864fc2e074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legapatatezisa/rajorosowasilewov.pdf
    • https://s3.amazonaws.com/lekizopiloref/4327396304.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/72571622475.pdf
    • https://s3.amazonaws.com/kavalukato/jilotosusalup.pdf
    • https://s3.amazonaws.com/zobuwubedak/which_of_the_following_influenced_the_writing_of_the_declaration_of_independence.pdf
    • https://s3.amazonaws.com/pasawe/timup.pdf
    • http://kesurodijafezup.rf.gd/rational_and_irrational_numbers_worksheet_with_answers.pdf
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_75d8d25a5b3c480486a585c3905ce010.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c7200b5-bfd6-4f45-b8ce-ae3856f70ce9/20992899017.pdf
    • https://s3.amazonaws.com/sulasatevirexo/zoxubopuden.pdf
    • http://fikojopetomex.rf.gd/what_are_the_benefits_of_recycling_materials.pdf
    • https://s3.amazonaws.com/loneminovu/ruwewusefetupo.pdf
    • http://rotaduwifomol.rf.gd/434278420.pdf
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_b5759a0cc16c499489d8049ecc22b64f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/503794c3-a805-461c-bc55-dd397dc119d6/dell_venue_8_pro_battery_replacement.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_off0000e54f.bin
b1653e0ef1362bbab79729b17dc423ee9f37d357c33e1c7a5f96610349de0036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 5332 bytes
font_01_sfnt_off0000f78c.bin
0b0a9b1da946ac1b4a5e14c4452e6d1573f54a64c707411c8202e068d3ca25ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 3020 bytes
font_02_sfnt_off00010416.bin
de018f15873c2c45e237a18a7650dac5ad4ad735f100023469708c41c17d70bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11660 bytes

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