Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9735e9c2997645…

MALICIOUS

PDF

83.0 KB Created: 2021-05-06 23:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18459875eeac11d984ae760fcda16d13 SHA-1: 20fa1cf25e79a4fba441dd910f4f679360ba0359 SHA-256: 2c9735e9c2997645cb60899509f8812036176e71b067b78cf7e75d5752952d7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, indicating a link farm or SEO spam campaign. The primary URL, https://gimoguvi.ru/strik, is likely part of this scheme to drive traffic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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-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://gimoguvi.ru/strik?utm_term=female+criminal+attorneys+near+me
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/livatatolozul.pdf
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/jexoja-zogedun.pdf
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/vanugudux_bowodupobi_vetokidafil_nijorebom.pdf
    • http://dekiweragaf.mywebcommunity.org/exin_agile_scrum_master.pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/51230.pdf
    • http://elinekici.online/how_to_start_craftsman_air_compressor7dnwu.pdf
    • http://gukivuzijisuva.getenjoyment.net/zipoxox.pdf
    • http://useplafond.xyz/karuzijixozosalava78w5.pdf
    • http://business-open.online/60003670499l8gny.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/17bef5.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/8230101.pdf
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/25650796117f.pdf
    • http://helpcenterbusiness.xyz/tajweed_rules_of_the_quran_part_3f72x8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kaloruligot.onlinewebshop.net/vizio_model_e320-b2_manual.pdf
    • https://s3.amazonaws.com/xajowu/panasonic_pbx_tes824_software_download.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2399564f81ff4a268d436d665452eb51.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/online_gif_maker_free.pdf
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_2cbac32767784456a2743bdd6c14098e.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_28ef19252f784d749e2cdd06ebb15945.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_6c1781318bfe47a29e95515a97e52db4.pdf?index=true
    • https://s3.amazonaws.com/biwuwukesazef/jututulomuzob.pdf
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_9d3b90978beb4839b951a0801936b036.pdf?index=true
    • https://s3.amazonaws.com/benuka/palirijonadotan.pdf
    • https://s3.amazonaws.com/fatikonavori/88550504219.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_off00010840.bin
37fd6aa56eca2add774da4653fdc741f891205ae4ec5ae3ce89fa8301ffc1fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 5000 bytes
font_01_sfnt_off0001192f.bin
803751ddaa13340472fc6e6e36a2694c6e5426d8daa3ea144853d8860f6c7f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10768 bytes

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