PDF malware analysis — malicious · c7a0bb59b4584c7c

MALICIOUS

PDF

79.0 KB Created: 2021-02-09 12:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 35e5b9b0d000cd9e8b08d609511c0fe1 SHA-1: 6ee9030bda9ad5e6f5d49b57ea9598fa827a235f SHA-256: c7a0bb59b4584c7c9aff87070c0fa8a64c8fd35ec23a9fce6d16849f4b40f1af

252 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though partially corrupted, suggests a lure related to business expenses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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
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://yafferge.ru/wb?keyword=tracking%20business%20expenses%20spreadsheet In PDF document text
- https://pakidezosatujij.weebly.com/uploads/1/3/0/7/130775723/vivatetat.pdfIn PDF document text
- http://santaparker.store/557107921412kzom.pdfIn PDF document text
- https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/sijef.pdfIn PDF document text
- https://cdn.sqhk.co/fogobewataja/ifibghT/zivaturepor.pdfIn PDF document text
- http://chemistryplus.space/skyblock_map_1._14_4_tlauncher2cdho.pdfIn PDF document text
- http://wowmarket.info/bujeribelujaxumatolaso4fn0i.pdfIn PDF document text
- http://proba7.xyz/whispering_hillock_witcher_37j977.pdfIn PDF document text
- https://cdn.sqhk.co/folamudoj/kjdX9jc/tedowavosogani.pdfIn PDF document text
- http://community-day.ru/518247184469lydc.pdfIn PDF document text
- https://goladamopalej.weebly.com/uploads/1/3/1/3/131397974/davevenofo.pdfIn PDF document text
- https://kakituku.weebly.com/uploads/1/3/4/5/134589995/8dcec19ff911e5.pdfIn PDF document text
- http://priz24.site/dermatomiosite_e_polimiositezzfya.pdfIn PDF document text
- http://autoupgrade.website/pirate_dice_bag9uphm.pdfIn PDF document text
- https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/3f418e.pdfIn PDF document text
- http://shmelev.pro/27445502156304p1.pdfIn PDF document text
- http://smeh-mif.space/duermen_los_peces_libro6a8vt.pdfIn PDF document text
- http://soldonlittleton.com/icy_veins_prot_pallyrc473.pdfIn PDF document text
- https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/1a1b95.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
- 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_off0000e9ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9AC	5296 bytes
SHA-256: `a7e9d19507580b35d1af34a89a521c0d697d7c53000ceca90166600a4fc52015`
`font_01_sfnt_off0000fb9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB9B	10756 bytes
SHA-256: `fe6c52065b6d0054478a7a885ecb994301059b59310be9735c9a719168e0a905`
`font_02_sfnt_off0001204c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1204C	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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