Malicious PDF — malware analysis report

Static analysis result for SHA-256 72804da18ef68fa6…

MALICIOUS

PDF

78.0 KB Created: 2021-05-21 02:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276c68379a6a31e532261d7f249e1751 SHA-1: b66b3a6fa93ab853a2655921abf9968da91b7b2b SHA-256: 72804da18ef68fa63b40caae6e210ad7ca442bdeea641a9e085d47b22ff84bf9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a link farm of 30 external PDF links. The primary external URI points to 'https://zajinet.ru/strik', suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=teaching+methodology+course+pdf
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/4934681.pdf
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/nusofedototi.pdf
    • https://static.s123-cdn-static.com/uploads/4454691/normal_5fcbf0f31a789.pdf
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/bbfdbd0a4bc4d7d.pdf
    • https://kijilijesudopob.weebly.com/uploads/1/3/0/7/130739968/7887839.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_6042cdb008c0d.pdf
    • https://cdn-cms.f-static.net/uploads/4462993/normal_60150d14ab626.pdf
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/f674052fc.pdf
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/rinuderum_nalutufafedev_magum_fukezad.pdf
    • https://cdn-cms.f-static.net/uploads/4455194/normal_604036ba098fc.pdf
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/bijimutilipot.pdf
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/d2229a.pdf
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/9f9fee1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a76c8911-f07e-4324-a81e-0903af1271ed/wagokozozubidetakekibak.pdf
    • https://uploads.strikinglycdn.com/files/50baeea5-4aed-4e8f-9e10-8daa09a7a2af/percy_jackson_series_books_in_order.pdf
    • https://uploads.strikinglycdn.com/files/ecdee629-7939-499f-87bb-922bb40a030d/13367918279.pdf
    • https://uploads.strikinglycdn.com/files/9e57dc15-48a4-4643-b643-11ebd9460d22/99417552269.pdf
    • https://uploads.strikinglycdn.com/files/805a47e3-93a7-4860-b0b5-1a41358fba19/halo_bassinest_swivel_sleeper_button_functions.pdf
    • https://uploads.strikinglycdn.com/files/a1146def-ee24-4b85-b7ee-3d482eff0b26/8493347373.pdf
    • https://uploads.strikinglycdn.com/files/f2b3aeeb-6cb7-45c1-83bd-80a59e99cd9a/dujux.pdf
    • https://uploads.strikinglycdn.com/files/83a062f1-97d1-4a5e-abf3-353b13e08fdc/gesotedawepebasoguf.pdf
    • https://uploads.strikinglycdn.com/files/caa4efc2-667b-436c-8718-dc726eb2aa2f/lyle_mcdonald_rapid_fat_loss_review.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_off0000e4eb.bin
0d149fdd2a842fe263960be0dd4442c86d5fd0463b9ca3646743627a815932e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5500 bytes
font_01_sfnt_off0000f774.bin
5e92ba9377e53ae1841bf0174db66eecb36a1d6cbcad3d1d3d15b0183ebbd2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 11040 bytes
font_02_sfnt_off00011c72.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.