Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db7d6fc2789e3b9…

MALICIOUS

PDF

74.8 KB Created: 2020-12-15 00:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad6b07ae5a22b517fc506865601f95d9 SHA-1: 65ab13d7366ec24bd14305233447e195a2072b42 SHA-256: 2db7d6fc2789e3b9ef0b58f7c115b4038b353c28285bd361365233f5722de2b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one with a UTM parameter suggesting a phishing or scam lure. The presence of multiple external links on disposable hosting, as flagged by heuristics, further supports a malicious purpose, likely to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=2nd+wedding+anniversary+gift+for+husband
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/rudugezoxu.pdf
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/pamelaguloxe.pdf
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/9017c67e59.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/03c6f5f195.pdf
    • https://nasinapalu.weebly.com/uploads/1/3/0/7/130739684/ed6a6e98b.pdf
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/fupulagasolan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc0f41f116eb00e3c4c3887/t/5fcd8125978da30c5614aff8/1607303462191/loudoun_county_property_tax_relief_for_seniors.pdf
    • https://s3.amazonaws.com/felasorarabipis/family_and_friends_4_workbook_answer_key.pdf
    • https://s3.amazonaws.com/limepusotanal/38993106382.pdf
    • https://uploads.strikinglycdn.com/files/b8a4ca7c-a525-4ccf-a33e-c0dc5db8ebf6/mount_and_blade_viking_conquest_companions.pdf
    • https://s3.amazonaws.com/genedesowul/pojuzulinax.pdf
    • https://uploads.strikinglycdn.com/files/2011fcea-7a18-4f88-9042-6352f490fbce/nojedadumabeg.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_off0000d928.bin
4b2e1441b8be81cdeb5f4d959634fdd08e95fc30bd0e61b0a9d0220beec6b30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 5452 bytes
font_01_sfnt_off0000ebb6.bin
69bacbf3a283f0818cbcfd774f3f46283ef577858097ab9db74d322e39bf63c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10920 bytes
font_02_sfnt_off00011072.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 4324 bytes

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