PDF malware analysis — malicious · 6da7b007c3f8ebeb

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 09:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 56a6df818854d012373bcea4149fa0cc SHA-1: c8d00722e5bd814a1ca562869110c8597fbe4299 SHA-256: 6da7b007c3f8ebebd958520893457bb4dc2d8fd6abb06b8df1e856c32d29ce97

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with a primary URL pointing to 'golowaki.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest it is designed to redirect users to potentially harmful sites, likely for phishing or SEO spam purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=apis+mellifera+carnica+pdf PDF link annotation
- https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/nifalavodeg-bitejikufinatoj.pdfIn PDF document text
- https://cdn.sqhk.co/tuxonewebuke/bhhjijb/2927356065.pdfIn PDF document text
- https://cdn.sqhk.co/lodikorep/axhe0if/65778029889.pdfIn PDF document text
- https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/8c16d94eecbc5.pdfIn PDF document text
- https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/2155397.pdfIn PDF document text
- https://cdn.sqhk.co/xaduwudixum/jfhgebf/groupme_app_download_mac.pdfIn PDF document text
- https://cdn.sqhk.co/kajutizikodu/BhwgdDB/beaded_jump_rope_walmart.pdfIn PDF document text
- https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/vosizadebodaxodi.pdfIn PDF document text
- http://pufisiluvapugif.22web.org/94712987641.pdfIn PDF document text
- https://cdn.sqhk.co/galudubujuwa/bniihdR/dune_1984_imdb.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c7dead62dae3403fbbd95282d2cc6fd3.pdf?index=trueIn PDF document text
- https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_6935e96abd81443ba42b9499d498b85a.pdf?index=trueIn PDF document text
- http://sivutesafukim.rf.gd/how_to_use_a_maytag_portable_dishwasher.pdfIn PDF document text
- https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_c453c8342fd945e088f7226970722c62.pdf?index=trueIn PDF document text
- https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_4ce049b108f44f3ea04d18f0fdec8ee7.pdf?index=trueIn PDF document text
- https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_f931fb5458d2455b8760d0fae4d7594f.pdf?index=trueIn PDF document text
- http://sonisan.epizy.com/90838282320.pdfIn PDF document text
- https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_f3fd953ab0ad48d0a988e83b45121663.pdf?index=trueIn PDF document text
- https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_25b11cd38cde460ca0d4c62b0b6484df.pdf?index=trueIn 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_off0000e47d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE47D	5288 bytes
SHA-256: `f652156bea2409a2941b7450c6537db0ddd07fa48c3e4e41c3af0cf304018847`
`font_01_sfnt_off0000f65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF65F	12804 bytes
SHA-256: `3e414fe1119e271ec2f22889827ff331593cfc4ad0fcec2efe7652cfc745626a`

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