PDF malware analysis — malicious · d6b26b5b7cd94175

MALICIOUS

PDF

87.7 KB Created: 2021-06-10 00:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 8ef2422619c01ce65afb7f4cf0f6be32 SHA-1: da44d44dc4d8fa8d831941e0d5d28b796c8624e0 SHA-256: d6b26b5b7cd9417556e5e6bb3aee2dfe358295d7a24704579f7ab4a151d241a6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=esl+activity+sheets+for+beginners PDF link annotation
- https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/3453652.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490746/normal_60299168c3560.pdfIn PDF document text
- https://xitawameduzip.weebly.com/uploads/1/3/4/5/134511141/8864907.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470836/normal_60ba4d633283a.pdfIn PDF document text
- https://gajodugibo.weebly.com/uploads/1/3/4/6/134635488/mojetikaxutu_zegone_pixitij_sezuzuzexe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467955/normal_604f69e065c5f.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4375518/normal_60b32a4992d6d.pdfIn PDF document text
- https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/9952751.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4386330/normal_5ffa226c59177.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4457272/normal_60240d52875f9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414502/normal_5fe567b4bef73.pdfIn PDF document text
- https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/896d9f.pdfIn PDF document text
- https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/571835c6.pdfIn PDF document text
- https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/bajomixiva.pdfIn PDF document text
- https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/7909008.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475719/normal_6040184ab24a5.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/16ded83a-62fd-459e-be8c-14883ac2e385/what_is_a_primary_and_secondary_standard.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/58c4c601-61ce-4a91-9e3d-68b5d580167a/mp3lio_mp3_free_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c81309c6-f1e2-4625-8906-f12a66227db7/5164428747.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a64610b5-4453-4c75-9179-ce35d80f5a3e/front-end_web_development_the_big_nerd_ranch_guide_github.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dd5a2d0f-dbc7-449c-87e9-ba660a95c9c9/how_to_put_wood_on_wall_without_nails.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7d278b4f-a5ef-45b2-879a-62a9ca9af958/15083954012.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/df9ba585-a9cb-4104-8025-aec9101afeeb/84932916451.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_off00010b30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B30	5188 bytes
SHA-256: `bd2bcc5e2337d7e01debc2a844b6c1a9428f112557e7f63765c26739282339f9`
`font_01_sfnt_off00011cd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CD2	11196 bytes
SHA-256: `bb73c9652668a8e1da37b8cccb2e952f3466c6f9548ead86945723b843734a21`
`font_02_sfnt_off00014309.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14309	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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