PDF malware analysis — malicious · 5a42c0c68d8e8a9a

MALICIOUS

PDF

81.3 KB Created: 2021-05-29 03:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: c9be4385641728076b971a5c6992cbe6 SHA-1: 2c6d96a91fa53fb0d4bb67e1857e26aa88cf4a01 SHA-256: 5a42c0c68d8e8a9ac18a40daf1978875feec7b45452463808f3660fa442e12e3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://mezovuduw.ru/strik?utm_term=what+is+elegy+poems+all+about, is likely a redirector to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to direct users to external, untrusted resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=what+is+elegy+poems+all+about PDF link annotation
- https://cdn-cms.f-static.net/uploads/4490128/normal_606a9752e10b8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374983/normal_605ffb80ef8b2.pdfIn PDF document text
- https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/xonutobonolutuvaluku.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4380543/normal_600842a125c0b.pdfIn PDF document text
- https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/6424045.pdfIn PDF document text
- https://kujinorenut.weebly.com/uploads/1/3/4/3/134319997/05647978bd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415944/normal_5fdbb631130d4.pdfIn PDF document text
- https://tufefuru.weebly.com/uploads/1/3/4/6/134621659/ec9bac4b7a224.pdfIn PDF document text
- https://lenukomezol.weebly.com/uploads/1/3/4/3/134311572/a743d1e3.pdfIn PDF document text
- https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/bc43460f2.pdfIn PDF document text
- https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/fee60fc32a5e35.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427091/normal_60680e0771298.pdfIn PDF document text
- https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/f4e2ca81f.pdfIn PDF document text
- https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/sanowibewodip_pupuvofopa_gejimujikob_demefosipiki.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4488335/normal_60385610ad717.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464878/normal_60132af3f0e29.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426260/normal_6059a81a92352.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4373248/normal_5fe3497393caf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495400/normal_5fe03cdb6f163.pdfIn PDF document text
- https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/9531905.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
- https://uploads.strikinglycdn.com/files/43bbac01-057b-40d8-8c86-373328377f4c/26270622674.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c1a55d17-d9e8-407d-8682-a48c391b0e23/dugosukexelewazukesiwo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7d2945ea-c62d-4cc1-84a5-ae10db584e1e/python_language_basics.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_off0000f2d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D6	5168 bytes
SHA-256: `af36c573ca9e7ab26afda2759d18bc188fb54c8c47fe629370b8eeb02701a2a2`
`font_01_sfnt_off00010485.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10485	10856 bytes
SHA-256: `a168cb693c86312321c40e0b72063cf6168e7e2ef83dd306098e0a5fc90e057a`
`font_02_sfnt_off0001298c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1298C	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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