Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b72ee23d8f5bd9c…

MALICIOUS

PDF

82.4 KB Created: 2021-05-11 07:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff1c3512b39472bd168494080f0ab65 SHA-1: 5dafc7719eb57c0630db951590d6e5eecc3553ea SHA-256: 5b72ee23d8f5bd9c30730b5539ca08556fe1b2cdde6e7de1d6e2b5897a981949
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, indicating a phishing or scam attempt. The primary malicious URL identified is 'https://xezojetit.ru/strik?utm_term=how+to+use+toyota+key+programmer', which is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

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://xezojetit.ru/strik?utm_term=how+to+use+toyota+key+programmer
    • http://totalcreditcheck.info/rovewojexafeseviikaal.pdf
    • http://usesucre.pro/how_to_read_architect_scale_1_8cwz9r.pdf
    • http://roralukomoko.22web.org/47170234940.pdf
    • https://cdn.sqhk.co/zisuzunon/QkiacKi/wesaruse.pdf
    • https://cdn.sqhk.co/pozipulavat/jfjfhgG/83652676613.pdf
    • http://mugedly.xyz/61556979067tmea2.pdf
    • https://cdn.sqhk.co/vetukalujir/viiuif0/gamade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6482b42b-da4c-4ace-accd-bb79be5128b8/97775143618.pdf
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_73d5f958664d43db9854ae779e3c8950.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_908dc3936bfb4e74ab0186b747ca58f5.pdf?index=true
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_942c48b2ae714fce8b910cba9663c0c8.pdf?index=true
    • https://4144cd26-5350-466f-b793-1bb211c0065b.filesusr.com/ugd/b5472a_70770dac79d54c62b66b4e179eccfb14.pdf?index=true
    • http://neveket.epizy.com/56092090126.pdf
    • https://uploads.strikinglycdn.com/files/3bb14337-bc2a-4cea-af6e-fc69b66675cd/14998605833.pdf
    • https://uploads.strikinglycdn.com/files/dcf8231f-f80e-4401-af37-f5b00cad35e9/nuxazunupamipasagixorax.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_2d209491ae2644dabd946da0d7c77165.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75478a94-aabe-4e84-821d-3912463ce874/zaguzulokufatiwax.pdf
    • https://uploads.strikinglycdn.com/files/ff7b34a1-7c23-48f7-afad-32dfb8e331d7/bumuv.pdf
    • https://uploads.strikinglycdn.com/files/8d4dfa7c-c5de-4e3f-bcff-9ef2e7a9015d/98805938346.pdf
    • https://uploads.strikinglycdn.com/files/95122cec-29aa-4f83-8b53-b320e4171dca/kidde_nighthawk_reset.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_off0000ef22.bin
367595a7256f17afb83a0cb9f866c1acc8be2590afdc5a9c4ee64e0cf897a044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5324 bytes
font_01_sfnt_off00010148.bin
c4523f50bb3e05047787b5ba50ad772b2f52db64b0da9eae59522068db2334da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10916 bytes
font_02_sfnt_off000126ea.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16204 bytes

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