PDF malware analysis — malicious · 80b33a43a7de856c

MALICIOUS

PDF

76.7 KB Created: 2021-02-08 11:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05

MD5: e5baa4382cb56594bc2ab8b6072f7719 SHA-1: f5abae20f6904884b5b0c25b9e0b4fa58d1a18e6 SHA-256: 80b33a43a7de856cb5b932dc08873c3ae19dc512788284eaa34c4fbceaa8f75e

254 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution attempt. The document contains numerous links to external PDFs, many of which point to redirector infrastructure like 'https://crophysi.ru/123?utm_term=music+2252+osu', suggesting a link farm designed to obscure the final malicious destination. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
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.
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://crophysi.ru/123?utm_term=music+2252+osu In PDF document text
- https://cdn-cms.f-static.net/uploads/4367301/normal_5fd7f8b0494e0.pdfIn PDF document text
- https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/7305998.pdfIn PDF document text
- https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/fonetopumaf-vupelenuvalase-ropalamor-wuririlasega.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412164/normal_5ff615f00f232.pdfIn PDF document text
- https://cdn.sqhk.co/bumogebiz/jyg7iiM/51525763865.pdfIn PDF document text
- https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/5421639.pdfIn PDF document text
- http://hh666o.site/indivisible_guide_2._0ap6sd.pdfIn PDF document text
- http://pornbustyvids.com/asme_steam_tables_calculatoryant7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369494/normal_5fe3aefa4836f.pdfIn PDF document text
- http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
- http://www.typoland.com/In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://duliwijedij.rf.gd/veginezilibowitaj.pdfIn PDF document text
- http://biwodonugawodil.rf.gd/game_asphalt_6_adrenaline_hack_java.pdfIn PDF document text
- https://s3.amazonaws.com/midaguvimabof/liralevowopixonebonifonir.pdfIn PDF document text
- https://s3.amazonaws.com/limewub/balu_telugu_movie_songs_320kbps.pdfIn PDF document text
- https://s3.amazonaws.com/dazemi/international_phonetic_alphabet_transcription.pdfIn PDF document text
- https://s3.amazonaws.com/jubiferekaka/47991902839.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_off0000df94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF94	6168 bytes
SHA-256: `9f07a400e75c177e496f395344003d4a7545e118b36bf59d530d47f9bb3550f8`
`font_01_sfnt_off0000ef33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF33	4716 bytes
SHA-256: `11ee911dd658ffa06018365b7275e37c7e6aae0af2d67c3fe3eda76eadecc1eb`
`font_02_sfnt_off0000ff6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF6F	11604 bytes
SHA-256: `c0d1b20474dae6fb189257cb994a6816be1247f9900103d11f21c3ded4e6cf45`

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