PDF malware analysis — malicious · d8ce3eddb0ddf862

MALICIOUS

PDF

74.1 KB Created: 2021-02-20 16:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: a5fc79666b77d4081c899e9cf07ee8e3 SHA-1: ef25de6ee21559b9eea4de66597f4f15aa2fa348 SHA-256: d8ce3eddb0ddf862b6d4296bb708c55e281edbb3c225a18984ca4998f76eb224

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with invisible links pointing to suspicious domains, suggesting a phishing or malware distribution lure. The document body was heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous external links to potentially malicious domains strongly suggests an attempt to redirect users to harmful sites.

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
Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE

PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
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://maypoin.ru/aws?utm_term=cobra+29ltd+classic+mic PDF link annotation
- https://cdn-cms.f-static.net/uploads/4369643/normal_602753bfec2b6.pdfIn PDF document text
- https://cdn.sqhk.co/nebinefis/hd0mii4/love_stories_tv.pdfIn PDF document text
- https://cdn.sqhk.co/tononapiwaso/jigciiG/25240221984.pdfIn PDF document text
- http://fitit.space/288086525077aacr.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373999/normal_6027fadb13503.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4499972/normal_60065c8d59544.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380383/normal_602dae20b6abc.pdfIn PDF document text
- http://musc-media.xyz/vex_on_tangled_shore3nygz.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4476930/normal_5ff7579fea6da.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392453/normal_5fca59faa8df3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480173/normal_5ff9c8ccc76d9.pdfIn PDF document text
- http://itravelimpressions.com/samsung_s10_5g_wallpaper7orad.pdfIn PDF document text
- https://cdn.sqhk.co/wejawujagi/bQz7tTc/molaganizakekikilanuverek.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366325/normal_6027cd2e2dd61.pdfIn PDF document text
- http://ig-supportcenter.xyz/29108918233p6yn3.pdfIn PDF document text
- http://leomannapov.com/pekaziwekileruwopdc0.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/jasipefulaxiduj/how_to_cancel_rosetta_stone_subscription.pdfIn PDF document text
- https://s3.amazonaws.com/wupuxus/silopibasatezegifakegife.pdfIn PDF document text
- https://s3.amazonaws.com/rizoli/chemistry_122_worksheet_chemical_equilibrium_review.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_off0000d4fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4FA	5100 bytes
SHA-256: `1c6ff1f175b35048f41e9bf8cda3842fefc5ff1258488f66220c21aafa15f71d`
`font_01_sfnt_off0000e646.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE646	11472 bytes
SHA-256: `34525a0aa088c27d9c8f3b0226304e57fb4c8888fc1e7435839578c91a53d561`
`font_02_sfnt_off00010d3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D3B	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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