PDF malware analysis — malicious · 6bf656af23e94fe6

MALICIOUS

PDF

80.2 KB Created: 2021-01-30 13:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 4626901edd882e7e6b1be4d0ac7e261e SHA-1: 1624f490d704bb58ba31353e027bc4cd697fb6af SHA-256: 6bf656af23e94fe65226097655258ea108673a61dc21278f24416c0ee52cb575

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to various external PDF files, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/123?utm_term=action+camera+market'. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the assessment of a phishing or malicious redirection attack.

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
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.
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/123?utm_term=action+camera+market In PDF document text
- https://cdn-cms.f-static.net/uploads/4486344/normal_5fe6511dccb76.pdfIn PDF document text
- https://cdn.sqhk.co/xexisini/fjcob3g/96377726358.pdfIn PDF document text
- https://cdn.sqhk.co/fujesepulo/YZhijas/bidivutaligugapewaxite.pdfIn PDF document text
- https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/c72d1.pdfIn PDF document text
- https://cdn.sqhk.co/bonosexov/jI8gd7J/10603018124.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369774/normal_5fc7fea436eda.pdfIn PDF document text
- https://cdn.sqhk.co/merivexasug/xgydvjd/hard_time_prison_sim_mod_apk_unlimited_money.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4386361/normal_5fcfe585e5057.pdfIn PDF document text
- https://cdn.sqhk.co/vumivatuvi/jcFjeje/flight_simulator_2020_ps4_price.pdfIn PDF document text
- https://cdn.sqhk.co/wuzosiboweja/Ngfghif/moto_g_power_specs_phone_arena.pdfIn PDF document text
- https://cdn.sqhk.co/wezikinupig/qji8erx/xibabalesoralonomifudodog.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413707/normal_5ff3c321d7768.pdfIn PDF document text
- https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/9152194.pdfIn PDF document text
- https://cdn.sqhk.co/xifusajexom/dDjiqd4/85166464606.pdfIn PDF document text
- https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/8416016.pdfIn PDF document text
- https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/4869814.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://medesawawolujim.epizy.com/rutinivajumiwigexomiwepof.pdfIn PDF document text
- http://sokevigaku.rf.gd/56670113337.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_off0000f13b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF13B	4576 bytes
SHA-256: `6b19fc6947d31ece06fb9135862639f5479138428d7fddda66f0432f79fd0f48`
`font_01_sfnt_off00010091.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10091	10912 bytes
SHA-256: `77d71f4fe2f1065541e98546683d77958aa2bc09e6a4316f8b0d2dd2d7ad843f`
`font_02_sfnt_off000125c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125C3	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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