Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a0663fcf648168…

MALICIOUS

PDF

88.5 KB Created: 2021-05-25 08:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f268f285444fecf398d14ca0b4aed16 SHA-1: 17fd1a9bd0709fc95908268789763e0605a1b7ee SHA-256: e7a0663fcf6481688d606b265f7b91221f00d123af679a7fb1d3f92bbda6edc8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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-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://kuzutuzo.ru/strik?utm_term=sentence+fragment+practice+the+imposter+answers
    • https://xiwajobuxeke.weebly.com/uploads/1/3/4/6/134637113/kuwipamejabuzu_dafaweruzux_jekuxibonuta_giraluw.pdf
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/fopawuzalolizik_dulujata_kefusojedoj.pdf
    • https://cdn-cms.f-static.net/uploads/4392872/normal_6029c4a18784f.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_603216e63bed3.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/xazumosakavo.pdf
    • https://cdn-cms.f-static.net/uploads/4475212/normal_600fcd440ebdb.pdf
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5ffb90b9cfff0.pdf
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/7dfc6e525c7f6dc.pdf
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fdf52dba0d0d.pdf
    • https://cdn-cms.f-static.net/uploads/4475737/normal_6054c744f3786.pdf
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/8872543.pdf
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/9828214.pdf
    • https://cdn-cms.f-static.net/uploads/4376606/normal_6025a10aca941.pdf
    • https://static.s123-cdn-static.com/uploads/4369334/normal_6004a25675f94.pdf
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/042f699081.pdf
    • https://cdn-cms.f-static.net/uploads/4383567/normal_6040077ec533c.pdf
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/norovinano.pdf
    • https://static.s123-cdn-static.com/uploads/4451563/normal_6003e568ca0bb.pdf
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/5156448.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5ddd832e-73d1-47e7-a34f-b120190178f5/pefapikufatazotaxe.pdf
    • https://uploads.strikinglycdn.com/files/90f487b2-969c-46b8-84a1-6941eedddcc2/fuvagakuliju.pdf
    • https://uploads.strikinglycdn.com/files/6a7863b1-89c9-497a-a150-342c4aeb9559/57943113771.pdf
    • https://uploads.strikinglycdn.com/files/298cbda3-7147-452c-b375-5004b89e76d9/the_man_in_the_high_castle_season_3_episode_5_wiki.pdf
    • https://uploads.strikinglycdn.com/files/45eabf36-fae0-423c-8880-1e3c69c908cb/anatomy_and_physiology_101_lab_exam_1.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_off00010d33.bin
5fdd4cf7873cc1521f8c4e0e6697b239817576663aea1986bd336d21b2cb0128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 5380 bytes
font_01_sfnt_off00011f5a.bin
5346cfa2d6a6918ab7f44b54042240c8323b73eda6e8692c7783e1548830ddde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 11304 bytes
font_02_sfnt_off000145f0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145F0 4324 bytes

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