Malicious PDF — malware analysis report

Static analysis result for SHA-256 8139b2e18ec9ba9b…

MALICIOUS

PDF

70.6 KB Created: 2020-11-18 18:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1a489b22fb3d055152418787e854e9 SHA-1: 188d1cb99fb708fa00cd6a13798ff51f363bca6e SHA-256: 8139b2e18ec9ba9b0a1e9726118ce9f5ab18b451eea8d912aef17a079471a40c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://traffnew.ru/123?utm_term=read+after+we+collided+online+free', is flagged as suspicious and likely leads to malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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-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://traffnew.ru/123?utm_term=read+after+we+collided+online+free
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fad5cdb199c8.pdf
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/8543492.pdf
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/lelidozaxim_jotagujerimev.pdf
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/3946656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c5306abb-37ce-4229-a74a-03de64af459c/76057134890.pdf
    • https://s3.amazonaws.com/ribowexulo/general_chemistry_1_final_exam_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/3cde8b64-9683-4bd1-b70e-fb2bc6817fef/lebox.pdf
    • https://uploads.strikinglycdn.com/files/917b647b-7eac-46f0-b32a-b1d213affe75/amana_tandem_7300_dryer_thermal_fuse.pdf
    • https://uploads.strikinglycdn.com/files/40786011-80e7-4fe3-ae16-4ceb0dab8e7f/city_siege_3_fubar_hacked.pdf
    • https://uploads.strikinglycdn.com/files/4c92e1b6-6226-42f0-8fbd-58fa0173923e/sentrilock_realtor_lockbox_hack.pdf
    • https://s3.amazonaws.com/gurafoga/quicken_metamagic_rod.pdf
    • https://s3.amazonaws.com/gixawetopoli/67340875374.pdf
    • https://uploads.strikinglycdn.com/files/c2acb909-9c7d-4459-b2e5-21425f80d738/lojaxanezinavitazaw.pdf
    • https://s3.amazonaws.com/wisuw/89510059311.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_off0000cab8.bin
d90170c96082e1758d3eaed9aef7e09a8d59fcca2f81b647b4ecf258509395a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 4724 bytes
font_01_sfnt_off0000dadd.bin
55836329c70fdab2eed0b9aea087b8257d327c44bd3bac72e8fdc9a7a59ab577		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 10764 bytes
font_02_sfnt_off0000ff56.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 4324 bytes

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