PDF malware analysis — malicious · 31ae813c068cdf2f

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 12:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 135e32aef2a3d75801e5be7074f56c14 SHA-1: c4d2d34fb4659a3da1d3cf352ea8e1a351487d46 SHA-256: 31ae813c068cdf2f32074a347e18876d020a9de370a3352873bf10a74e6ee7a6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://gimoguvi.ru/award?keyword=balance+of+payments+definition+pdf PDF link annotation
- http://uanews.website/beamer_template_gallerybb2d9.pdfIn PDF document text
- http://chebsvet.ru/ruvinizejopajulezm6k49.pdfIn PDF document text
- http://mybiol.site/xegalujerekonofavaletobxpgkh.pdfIn PDF document text
- http://good-production9.site/samsung_rf4287hars_ice_maker_not_dispensingtbvi7.pdfIn PDF document text
- http://faceit.su/que_es_la_tiroides_alta_en_niosbc4b1.pdfIn PDF document text
- http://sokfresh.fun/lexejetogosanozozupedu13f9n.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://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_5ef4b56482bc4d5e86e1611493b46953.pdf?index=trueIn PDF document text
- https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_91ea330c75e5488f8813667adae0e548.pdf?index=trueIn PDF document text
- https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_8db806a6bc5143ea8e0633755c802c40.pdf?index=trueIn PDF document text
- https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_b8216e7ec5234602b4fe04a33694ccd6.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/87735908-88cc-4c51-8713-ae6ca904816e/what_does_priority_date_mean_on_i_797c.pdfIn PDF document text
- https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_c8e0dd83e32f409bbc6cf0d13c49f8c0.pdf?index=trueIn PDF document text
- https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_1ed0d4662af94d3896d0d4beaeedf7ec.pdf?index=trueIn PDF document text
- https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_ee95c549cc7940dcbc9c26fca19d1198.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/08744dd0-3830-40f4-a11d-5a95747790b6/90338118300.pdfIn PDF document text
- https://5dfb2dbd-6c80-4a99-afab-57dcddd938ef.filesusr.com/ugd/79d40d_a3bd70e589e048eb9b096e0e5dd9de4b.pdf?index=trueIn PDF document text
- https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_a0afed3f555046f9bd3da3916303c683.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_off0000ee2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE2E	5144 bytes
SHA-256: `db7964539fa88b1ddf117bb396f4896688961132e87ae3e3f21dc0cd54840242`
`font_01_sfnt_off0000ff9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9B	11076 bytes
SHA-256: `f839364b17342a64a7868dec6619a23569ffe74fd17f5e21813af941bd568d98`
`font_02_sfnt_off00012579.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12579	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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