Malicious PDF — malware analysis report

Static analysis result for SHA-256 b113bebbcb373bb7…

MALICIOUS

PDF

81.2 KB Created: 2021-03-23 01:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3715b9400a1f3116cbf92fdb4dcfd3a1 SHA-1: 7cb62fbf1249882e8eced5c01a29b0f1be2eff0c SHA-256: b113bebbcb373bb7d9496722a5a9ce356524aa1fb0b16fdc51ce96fe4ee00e3b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to unknown or potentially malicious domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

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/strik?utm_term=casio+ms-80bm+battery
    • http://constructionhouse.info/why_is_waiting_for_godot_called_an_absurd_playq27i2.pdf
    • https://cdn-cms.f-static.net/uploads/4417319/normal_602d8be037d56.pdf
    • http://1pokypki.website/58205899553kqvkp.pdf
    • http://wssummer.space/word_doc_tax_invoice_templatee61du.pdf
    • http://koolmaxt.online/97820446069xbo5z.pdf
    • http://meetcabinets.xyz/36486746528movqc.pdf
    • http://prostosite.site/kirebot0tmvj.pdf
    • https://cdn-cms.f-static.net/uploads/4393908/normal_6042c886279ec.pdf
    • http://belplitka.ru/81125030414a3coi.pdf
    • http://prodit.space/addressing_mode_of_8086_microprocessorvl8jq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f8ce6ad-2f07-4324-be0a-1b345a9e317a/5990280648.pdf
    • https://uploads.strikinglycdn.com/files/83905dc4-a117-4c1d-8c3d-f07343ac94e2/homelite_grass_trimmer_string_replacement.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_54c88293218247c68dd0feeb3ad246fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/396e88be-c8f7-4f72-856d-2ec4900bb0e9/dezetudev.pdf
    • https://s3.amazonaws.com/dadupawo/ifrs_15_practical_guide_pwc.pdf
    • https://s3.amazonaws.com/tapelu/tc_electronic_hall_of_fame_reverb.pdf
    • https://uploads.strikinglycdn.com/files/e8d594b3-d549-47e8-b1a1-727aa74807cc/25289370686.pdf
    • https://uploads.strikinglycdn.com/files/d8784b81-7457-4849-a0e3-f5cc9ba93833/tenud.pdf
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_e33b3f00123f4794adce29a120f85db2.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e705.bin
3d2e87862ccc7152d7af0f21c2addca7c7b97bf4e768d6dc957a5156c23399fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5316 bytes
font_01_sfnt_off0000f900.bin
f6209b85a922983eae07682b91820d2ca7d451d885dc45e42395d463964c0da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 12268 bytes
font_02_sfnt_off0001231c.bin
8ea7f1c1fa5cae84799308c3b5277d4d512d786787cd8f2796a1af00f3b64e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16076 bytes

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