PDF malware analysis — malicious · 9d99a30a4b4595d8

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 16:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 8824ef0f417d45712757cf5838348d24 SHA-1: 4f6512198ab99491072a515dceff13d7c4ace687 SHA-256: 9d99a30a4b4595d858f81921fdffb58b3b99256b0e2469bfee464715f2c22f62

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The 'SE_INVOICE_LURE' heuristic suggests a phishing or scamming intent. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://leonvi.ru/award?keyword=authorisation+letter+sample+pdf PDF link annotation
- https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393893/normal_5fe9d0fec5eb5.pdfIn PDF document text
- https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/afa60cc4af8bf90.pdfIn PDF document text
- https://cdn.sqhk.co/kinibemazoz/hj6jhjc/bobafovatumifixoga.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4411246/normal_5fced129ac02d.pdfIn PDF document text
- https://cdn.sqhk.co/tipusuzog/CTghVpY/parks_chevrolet_charlotte_jobs.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4461219/normal_605236bb4fea2.pdfIn PDF document text
- https://cdn.sqhk.co/jedugifaxido/g7ibaja/76953919500.pdfIn PDF document text
- https://cdn.sqhk.co/tuzijaxab/jgfmVdF/99053514414.pdfIn PDF document text
- http://dazifarulonun.iblogger.org/lerolide.pdfIn PDF document text
- https://cdn.sqhk.co/gapalagabig/fPqy2YJ/25693186219.pdfIn PDF document text
- https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/bonakod_kifimu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365542/normal_604670f90d2d0.pdfIn PDF document text
- https://cdn.sqhk.co/nemoludajedu/ieihg7p/vofufu.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://s3.amazonaws.com/sazariwapa/letter_of_intent_to_buy_template.pdfIn PDF document text
- http://zegubexov.epizy.com/61492580766.pdfIn PDF document text
- https://s3.amazonaws.com/sazixipame/bsc_physics_question_papers.pdfIn PDF document text
- https://s3.amazonaws.com/paxuvagal/14884825667.pdfIn PDF document text
- http://binalidagu.epizy.com/taburiburokenowe.pdfIn PDF document text
- https://s3.amazonaws.com/luborinizu/what_is_a_stress_test_for_a_pregnant_woman.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_off0000efae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFAE	5152 bytes
SHA-256: `6189308f318ddf94a04a65820c172f80810accb55b99daeb438be35bad1ca948`
`font_01_sfnt_off00010101.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10101	10712 bytes
SHA-256: `55977a4fd9678cbb44ae3039428099937c8b164e6100503ef689e457377054ce`
`font_02_sfnt_off000125be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125BE	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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