Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa800dfdd8361a9…

MALICIOUS

PDF

79.1 KB Created: 2021-04-10 18:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33cc57c07e769be84fd3ace323f1ee19 SHA-1: 7924ca08e670a2cdbc129387603bddd525ca42df SHA-256: 1aa800dfdd8361a927d97ccc9e86c1e37c2a36fc19b5c1707f122f3fa9e21f67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a high-confidence ML classification as malicious. The primary attack pattern involves embedding numerous external links, with one notable URL being https://ponafet.ru/strik?utm_term=green+eggs+and+ham+characters+costumes. While no scripts were extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=green+eggs+and+ham+characters+costumes
    • https://static.s123-cdn-static.com/uploads/4392867/normal_5ff8cb2d6f2f9.pdf
    • https://cdn-cms.f-static.net/uploads/4421049/normal_602e1652c4cce.pdf
    • https://bexepusukanuv.weebly.com/uploads/1/3/4/7/134775428/7c62eff82fa56d.pdf
    • https://cdn.sqhk.co/lunosupi/ijGhBQ8/tachyon_the_fringe_cheats.pdf
    • https://cdn-cms.f-static.net/uploads/4367635/normal_603bcf7cddf00.pdf
    • https://cdn-cms.f-static.net/uploads/4487927/normal_604b3bd43e844.pdf
    • https://cdn.sqhk.co/reserujaj/8qihgeO/migokunobaragujovagome.pdf
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/volomovazufovob-zojodomin-misurin-nefiv.pdf
    • https://cdn.sqhk.co/komifugu/idijFPr/besovulesavujokiremen.pdf
    • https://cdn.sqhk.co/kovixileta/0Ygjfkv/56377384255.pdf
    • https://cdn.sqhk.co/pigajifaw/3gcnsid/jumping_santa_run.pdf
    • https://cdn.sqhk.co/vipujitebiki/gihfMja/the_walking_dead_nowe_odcinki.pdf
    • https://cdn.sqhk.co/fosikikevo/igijdc2/72202507271.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/13b2a176-f36c-4ea7-a0ce-307e9f3eb7dc/interpreting_histograms_worksheet_tes.pdf
    • https://s3.amazonaws.com/zuwosil/50971567491.pdf
    • https://uploads.strikinglycdn.com/files/7d67b74b-481a-48c0-916c-8d463d949ac8/how_to_sync_charter_remote_to_vizio_tv.pdf
    • https://uploads.strikinglycdn.com/files/60469324-9188-4396-b70e-68d2a0daf4e9/wakironebijesoxis.pdf
    • https://uploads.strikinglycdn.com/files/26d4cd1f-1dbd-466a-9e40-8678bb06d1f1/how_fast_is_a_dodge_charger_sxt.pdf
    • https://s3.amazonaws.com/xovekolamoxe/louisiana_food_stamp_income_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/c4096453-dccc-4877-a38f-722f5e66a5ef/82794563857.pdf
    • https://s3.amazonaws.com/nuxomigo/jefibumibadoki.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_off0000f64a.bin
7a499ffcd8cd0b90cdeea10b1f79cee4275d7064ae60c20836d0afd61ae64ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 5352 bytes
font_01_sfnt_off0001085a.bin
4cacea174ba5957965bf9d18e5e9e31f00461b8c1d49f6b97ca638dbe88fdf32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 11328 bytes

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