PDF malware analysis — malicious · f581baf1598cbe98

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 11:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 18e587627596f02a8e58864b2b90aed7 SHA-1: df11236a852171832a4e18395d5b9538c28c0a25 SHA-256: f581baf1598cbe98772f3163661965e7a995134770deba080416777546294a8b

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://golowaki.ru/strik?utm_term=how+to+create+a+budget+for+a+construction+company', combined with the document's apparent theme, points towards a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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/strik?utm_term=how+to+create+a+budget+for+a+construction+company PDF link annotation
- https://cdn.sqhk.co/sorubajuzoxe/gh4yhcW/10289449630.pdfIn PDF document text
- https://cdn.sqhk.co/kifuzopeko/hjgdqjj/voucher_game_id_top_up_ff.pdfIn PDF document text
- https://cdn.sqhk.co/kinirebuseva/ijageic/fumisetafubutulesefapatud.pdfIn PDF document text
- https://gavuzamamezi.weebly.com/uploads/1/3/4/5/134590232/sejowi.pdfIn PDF document text
- https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/fevufesolukosaxom.pdfIn PDF document text
- https://fazizutedo.weebly.com/uploads/1/3/4/7/134768054/8438801.pdfIn PDF document text
- http://tikixoji.mywebcommunity.org/english_textbook_year_5_kssr.pdfIn PDF document text
- https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/e8f03aff61421.pdfIn PDF document text
- http://xelamoxadavas.mywebcommunity.org/artificial_intelligence_and_the_future_of_work.pdfIn PDF document text
- https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/javupositulew.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e1e9f910c57f4509b1b2649a31d45134.pdf?index=trueIn PDF document text
- https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_5362c87b0c0247bb98b0e87cccd2a66d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/pazovugal/format_code_vscode_shortcut.pdfIn PDF document text
- https://s3.amazonaws.com/zolerazowubow/artemisia_herba_alba.pdfIn PDF document text
- https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_e388ad5f8b2b4cd9a5c96d3c0246270c.pdf?index=trueIn PDF document text
- https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_c43b944f1c1443d485a8a7f0505d6a14.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/jadere/radawosikex.pdfIn PDF document text
- https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_209a079762694d48a22c83d3967df161.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e9b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9B0	5740 bytes
SHA-256: `39e2ae58ac10ce51c3d73db5968e5c2a4de01eec88901a957d6665bc78fd0aa7`
`font_01_sfnt_off0000fd36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD36	2080 bytes
SHA-256: `312219753f3408ef35343611a0f5fb07e4c4fc97ebd7c466f3de94c479665445`
`font_02_sfnt_off000106fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FB	11216 bytes
SHA-256: `63b05dd95731cb74951a91426161aaa6758fcdaedd50c057c927542d210c7c8a`

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