Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68023fd9d5e3ec5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 16:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 904fd7a85630e06d3ec01519cfa0de5d SHA-1: 788baa70d99d1d33ba76e4a0630096865463a1ff SHA-256: b68023fd9d5e3ec5d88e7b573c7cbc267812ee4502eb6fb770574930ca2adb1b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/aws?utm_term=polygon+angle+worksheet
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60533ec6b66fa.pdf
    • http://wuxolikuxa.22web.org/15402986441.pdf
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fe679aa3579e.pdf
    • https://cdn.sqhk.co/puroneruk/gAiiUI6/dog_friendly_accommodation_near_chatsworth_house.pdf
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5feff48ed0908.pdf
    • https://cdn-cms.f-static.net/uploads/4382772/normal_601238d52ee0f.pdf
    • https://cdn.sqhk.co/pofadugilip/hhifib8/colossal_cave_adventure_game.pdf
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5fe4fac72525f.pdf
    • https://cdn.sqhk.co/pulovafafita/DhdNoji/87695214185.pdf
    • https://cdn.sqhk.co/nusekabe/0igjjCD/best_android_tablet_vs_ipad_mini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_0e399eac03fa405cb1363b728011680d.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_a3d06e0a5b97433aa3a27045740e4cfa.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_8109a2aba0e14a8f858cc0374f848048.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_0ccf0593eb1c4753b1934bcd18538a46.pdf?index=true
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_8d9df813bc89445ea711b89a32662b35.pdf?index=true
    • http://zazaluvuzusu.rf.gd/xekakip.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_727d595d5fcf4d408186c55ac797ff46.pdf?index=true
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_bf8aa2b0710f42cca74f65a11c294665.pdf?index=true
    • http://xevarefuwiku.epizy.com/difference_between_android_and_iphone_users.pdf
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_3a54e4aa8b664d2a97687d2e1a5e4150.pdf?index=true
    • http://tujisagozepiwon.epizy.com/how_to_use_engineers_elite_dangerous.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_55efc9b2efa14567bb7d349cd22f614b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4d.bin
444c5f8be495b7143b1ebfce7ab3bc1d44c1e549eaf0fdbb2c57ee375f455c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 5204 bytes
font_01_sfnt_off0000fe15.bin
1745d088df699884bd7c5e8b4d7715dd534c1e4fe38cbca9c6019fc43f13fa60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 10812 bytes

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