Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d12a2c04085738…

MALICIOUS

PDF

95.1 KB Created: 2021-03-16 09:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c8ae8332f52941d905ff07007850a5b SHA-1: 92454d225b391ba4100f4f3c1e075319fd86ead7 SHA-256: a0d12a2c04085738b6c49321075aaf4512fd9c3cf8d965b518cd32c4ef35e881
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to domains with numeric slugs, strongly suggests a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

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://lozipotod.ru/wix?keyword=shadow+mastiff+5e+dndbeyond
    • https://cdn.sqhk.co/mabisurud/gdOjj4h/56991098813.pdf
    • https://cdn.sqhk.co/rizitewav/jS8jfgf/wawarumexikofuxuginezax.pdf
    • https://cdn.sqhk.co/leporolino/MQihhhf/37953696137.pdf
    • https://cdn.sqhk.co/sorubajuzoxe/Oiajjig/1299113904.pdf
    • https://cdn.sqhk.co/vewukiziwemi/jghhJib/39835986917.pdf
    • https://cdn.sqhk.co/wemojezuvegi/gdhabf6/26752746169.pdf
    • https://cdn-cms.f-static.net/uploads/4492574/normal_604b50702f8a6.pdf
    • https://cdn.sqhk.co/girolivudafo/geOihgf/dark_red_blood_in_stool_causes.pdf
    • https://cdn.sqhk.co/bawusipa/oCRjcib/espn_nfl_picks_2019.pdf
    • https://cdn.sqhk.co/duwenaxiseve/SDjgfii/fajitopafozimo.pdf
    • https://cdn.sqhk.co/dizirajeb/ahgTihH/22720402228.pdf
    • https://cdn-cms.f-static.net/uploads/4450419/normal_6031875d59da6.pdf
    • https://cdn-cms.f-static.net/uploads/4371505/normal_601fcb6b7ede3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1630700-7dbe-4aab-958c-f851a6504783/communication_style_quiz_for_couples.pdf
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_853a2bd3c4e244168394d1044761edeb.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_7c67bb8089634099a8c571e3e28fb0f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/026925e0-a4ba-41a1-a36c-d4fed6cfc8b6/theories_of_distributive_justice_roemer.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_f7c42e3d50ab4cd28506285fcacb7e57.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d7f2117-cbd7-4918-bf6c-fc441ea5a833/bengali_to_english_translation_app_free_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f68.bin
1784a4521be2568e5c9e68c5dc73afb6e634066721a413e5b45bff529219a48e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 5580 bytes
font_01_sfnt_off0001325d.bin
502b5427184fc99eac28c02b15b90293b98361115795d08f2962b2e6303fd03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 12280 bytes
font_02_sfnt_off00015ab2.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB2 16036 bytes

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