Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5521d3e45a49d05…

MALICIOUS

PDF

91.5 KB Created: 2021-03-29 07:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f1bbd203d79f8d4a3aab4ff911d4dd SHA-1: d5b97b53231775186f071e345a1efcd68313f6ef SHA-256: e5521d3e45a49d05ea9519426d362c737daec6dec3cf0e41c19db0ff5e459d25
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to boost SEO. One prominent external URI, https://ponafet.ru/strik?utm_term=how+to+use+cricut+expression+without+a+cartridge, is likely the primary lure. ClamAV and an ML classifier also flagged this PDF as malicious, suggesting a phishing or scam intent. No scripts were extracted, but the presence of many external links points towards a redirection or content-loading mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+use+cricut+expression+without+a+cartridge
    • http://javebamugizal.66ghz.com/fungsi_spreadsheet_adalah.pdf
    • http://muxadar.22web.org/sectional_view_engineering_drawing_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zexozavo/89997541276.pdf
    • https://uploads.strikinglycdn.com/files/4d2a4dec-a900-4628-8fe5-226ac1599735/23898210878.pdf
    • https://s3.amazonaws.com/xirixepo/luzivufojadifedax.pdf
    • http://fatofejeripise.rf.gd/historia_del_cemento_portland.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_ca89370bed4b425fa9cdaa29d23d3fc7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c08413b0-9223-4453-9e1b-3096f8334bc0/59312917521.pdf
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_c63f0e1cb875416c94abee4c00249eb5.pdf?index=true
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_d2443b7ac36e482d8047947bdadcebb1.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_9715ba825bd94ad782c46843802d977f.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/dakifopovalebojolaselid.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_78e06e062bb049bea1dfd1723eec1db9.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fbddca546b6943f5bab765a30f0de85a.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/juxerokuxaxamidaj.pdf
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d82b2d330f5d476aa50dc30d0969ed56.pdf?index=true
    • http://nupefurarinokol.rf.gd/bipex.pdf
    • https://s3.amazonaws.com/xojafemori/challan_format_under_gst_act.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a3028882d7fe4027af8510d0481b23f1.pdf?index=true
    • http://wujijurawedike.epizy.com/guliwukibulidazavedatador.pdf
    • https://uploads.strikinglycdn.com/files/9ccb5ad9-f708-4249-ab59-c154cf585f65/archetypal_theory_in_literature.pdf
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_306451b924aa46879faf4d88f7b1a6f6.pdf?index=true
    • https://s3.amazonaws.com/lazesej/fisotoxaxi.pdf
    • https://s3.amazonaws.com/xezonijida/96900361368.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_bf7a5a46a2dc496ea4f47564db2b2424.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ae.bin
096c506722a365e2d4279ae12747d7e57405df1c20558fb915e36d6d5348c67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 5304 bytes
font_01_sfnt_off00012ac5.bin
f08cd7e2b61a18ec4ffcd9d44ce0b7934beacff736f50aa611d83a3951f0bba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 11764 bytes
font_02_sfnt_off00015196.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 4324 bytes

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