PDF malware analysis — malicious · 09a6f950bfe48177

MALICIOUS

PDF

78.9 KB Created: 2021-06-14 06:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 21bd39de852b7ef616851fc92bb766f0 SHA-1: cf969b0d58a1471cd15cf011d089abaa5d135e88 SHA-256: 09a6f950bfe48177f189f7b907fd36d3248ed8497d496e77eea7e4694caec0d8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The document body contains garbled text, but the presence of 'wkhtmltopdf' and 'Qt' suggests it was generated by a tool, possibly to obscure its true purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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 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://krisoc.ru/pbw?utm_term=construct+a+cumulative+relative+frequency+distribution PDF link annotation
- https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/dibedom.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391037/normal_6025e5d984023.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449793/normal_6049cae302324.pdfIn PDF document text
- https://tiwabegi.weebly.com/uploads/1/3/0/8/130874513/rogilajusokukes-loluko-simonax-wanosoxiferuder.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419206/normal_602f4334df3e1.pdfIn PDF document text
- https://lefesime.weebly.com/uploads/1/3/4/8/134882546/fasimaxanajadafixas.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466657/normal_600a3afbb7c2d.pdfIn PDF document text
- https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/viritezowu-fajoxosuturik.pdfIn PDF document text
- https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/47a0c0be1d8.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://pugaxigodaka.pbworks.com/f/26898882871.pdfIn PDF document text
- http://xuresasadox.pbworks.com/f/pharmacology_and_the_nursing_process_9th_edition_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b6b3cc56-8b45-4f5e-b2ab-377264163de8/48069905028.pdfIn PDF document text
- http://dokajawema.pbworks.com/f/roblox_jailbreak_mod_menu_download_android.pdfIn PDF document text
- http://reravupavad.pbworks.com/w/file/fetch/145144635/dj_light_background_video_download.pdfIn PDF document text
- http://togusan.pbworks.com/w/file/fetch/144427554/vamawukomejuzir.pdfIn PDF document text
- http://zudilazo.pbworks.com/w/file/fetch/145235031/jemevexixabimiwabej.pdfIn PDF document text
- http://siruzosu.pbworks.com/f/85280879877.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/48823a47-4ca1-459c-bb0d-7a4923dcd0c2/79118242211.pdfIn PDF document text
- http://fokopaviwu.pbworks.com/f/78909185448.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e3c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3C5	5500 bytes
SHA-256: `2dd459bb31aa66024490783f900f141106c4b4c720d83caba104dadb15ea0981`
`font_01_sfnt_off0000f66a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66A	12216 bytes
SHA-256: `b357b2dd057e8b785297a9dc76886e854881606dffeca36783eabb0660651917`
`font_02_sfnt_off00011fe8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FE8	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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