PDF malware analysis — malicious · 55fa37b68dddad7b

MALICIOUS

PDF

73.7 KB Created: 2021-06-07 01:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: ace27a1bf0d82d2333e33d4321f36781 SHA-1: 67bcaf187ccf8913cd4ff906ddf46ea374d980c0 SHA-256: 55fa37b68dddad7bbc919953d2529da2e25eafd3e3e7ccaee5681b1035fb9145

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest a tactic to distribute content or potentially lead users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://coretry.ru/pbw?utm_term=how+much+does+a+panzer+tank+cost PDF link annotation
- https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/fefibolopawumetina.pdfIn PDF document text
- https://fatisejodape.weebly.com/uploads/1/3/4/3/134320205/466553.pdfIn PDF document text
- https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/juzabebaxex.pdfIn PDF document text
- https://popugimamad.weebly.com/uploads/1/3/0/7/130775647/filusomerurefepu.pdfIn PDF document text
- https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/nofovulala.pdfIn PDF document text
- https://rezosegog.weebly.com/uploads/1/3/2/8/132814067/1081795.pdfIn PDF document text
- https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/632d671a549571f.pdfIn PDF document text
- https://mipajadotafev.weebly.com/uploads/1/3/2/8/132814286/vigobepuf.pdfIn PDF document text
- https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/pofepolekopero.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453908/normal_6041891338440.pdfIn PDF document text
- https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/dovoruruwime_duwajemam.pdfIn PDF document text
- https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/3048ada1b2c7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495254/normal_603c2b77e6969.pdfIn PDF document text
- https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/7661847.pdfIn PDF document text
- https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/jonade.pdfIn PDF document text
- https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/xufuzugimuzuri_jidaxum_pukagetifiriri_fumezubumetol.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374851/normal_6056a925c7b4c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://faxofapuf.pbworks.com/f/getoput.pdfIn PDF document text
- http://vejivab.pbworks.com/w/file/fetch/144468204/what_are_the_basis_of_apportionment_of_overheads.pdfIn PDF document text
- http://kakewizajupe.pbworks.com/w/file/fetch/144596913/lasegafonisotawavegijepo.pdfIn PDF document text
- http://foziwedugumu.pbworks.com/w/file/fetch/144598557/al_capone_does_my_shirts_test.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e3ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3FF	5448 bytes
SHA-256: `7619dbd31915203d33c68fed4c6890b3b81ac6fcbf21f1a1a6481d04889258fd`
`font_01_sfnt_off0000f672.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF672	10224 bytes
SHA-256: `c79649598dcc55a2bfd6cedee2c166fbbb12368ac48395a03ab816af963062ef`

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