PDF malware analysis — malicious · 0dc80a433f41e462

MALICIOUS

PDF

82.8 KB Created: 2021-03-15 15:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 2088a80020ba462fabd73764938122d5 SHA-1: a3eeda797e10c539a939377575a5eb41c1d33acd SHA-256: 0dc80a433f41e462096af4c8005ce04f7f0b805b0c4cb80dc5019f6b1df47667

196 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 appear to be part of an SEO link farm designed to redirect users. The primary URL, 'https://fokemale.ru/strik?utm_term=learn+chinese+online+youtube', is flagged as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest a phishing or malicious redirection attempt, consistent with ClamAV's 'Pdf.Phishing.Trojan' detection.

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://fokemale.ru/strik?utm_term=learn+chinese+online+youtube PDF link annotation
- https://cdn-cms.f-static.net/uploads/4447101/normal_6049efeeb427e.pdfIn PDF document text
- https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/d6bd5045370.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454302/normal_600260f5142d0.pdfIn PDF document text
- https://cdn.sqhk.co/nezerozara/vRyOgil/38263746842.pdfIn PDF document text
- https://cdn.sqhk.co/pazaxefuma/jhV9Ltk/leather_pants_outfit_club.pdfIn PDF document text
- https://cdn.sqhk.co/noneniwetav/hjbPov8/acode_powerful_code_editor.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368242/normal_601bb2ce21b46.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489415/normal_5fe7a6666b42f.pdfIn PDF document text
- https://cdn.sqhk.co/lukumuzu/haoic9I/lagu_hits_2020_indonesia_lirik.pdfIn PDF document text
- https://cdn.sqhk.co/bemaxopig/bgfEkia/nagewoliwewitebodawu.pdfIn PDF document text
- https://cdn.sqhk.co/definuseju/uhHvhaR/67155970133.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378856/normal_60145820c1763.pdfIn PDF document text
- https://cdn.sqhk.co/wefopijupe/jk4uK1k/49394231570.pdfIn PDF document text
- https://cdn.sqhk.co/jasurisunav/icWVgjo/zomavulosuvufuvitetekefa.pdfIn PDF document text
- https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/28fbbd23904a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412909/normal_6006a1d3170d9.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/2f0da80f-21ff-4ff2-bf67-a4fbcabdc94f/verbos_irregulares_en_ingles_presente_pasado_y_espaol.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/47182b60-0648-4722-bc83-3fc0168187c7/pigixurasiromoxuxoseli.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_off0000f8ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8AD	4952 bytes
SHA-256: `39da57cf3673233e145735165c615ad49e5801221ad7a31568f0d415a082dd55`
`font_01_sfnt_off00010978.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10978	11508 bytes
SHA-256: `c3f24611b49096b4ae4b196fb4332ecc7a2d57024764991a0340bd2c9b290011`
`font_02_sfnt_off00013010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13010	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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