PDF malware analysis — malicious · c426c90db4afd5df

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 16:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 93a0aa76170a61dfb22c7462ea98a9ff SHA-1: b4da6dc6eede7e9a5f5791153ac05d736e404152 SHA-256: c426c90db4afd5dff88077293a1b6a1e0df7965153875c2edd5dd46486e8bf05

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm with 30 external PDF links, many of which are SEO-redirectors. The primary suspicious URL identified is 'https://bologen.ru/strik?utm_term=rikki+tikki+tavi+story+summary', which is likely used for phishing or to serve a second-stage payload. The document body, though truncated and obfuscated, suggests a lure related to a 'story summary'.

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://bologen.ru/strik?utm_term=rikki+tikki+tavi+story+summary PDF link annotation
- https://cdn-cms.f-static.net/uploads/4489237/normal_601724ba75612.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417029/normal_602e2dc76f026.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486215/normal_60447634a4c50.pdfIn PDF document text
- https://cdn.sqhk.co/fifapupifig/4Hibiin/52002466173.pdfIn PDF document text
- http://romomikas.22web.org/makalah_akuntansi_pemerintahan.pdfIn PDF document text
- https://cdn.sqhk.co/dubagojovo/gcYnSji/nhl_video_games_on_pc.pdfIn PDF document text
- https://cdn.sqhk.co/buvoxinas/hTcjage/weather_near_me_map.pdfIn PDF document text
- https://cdn.sqhk.co/koletexun/egiidhb/pigutotipawo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4465025/normal_5fc59ffc6729f.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/e52808b3-c66b-46b3-8b8a-fd1e9ebfed3b/ice_cream_makers_amazon_us.pdfIn PDF document text
- https://s3.amazonaws.com/lukepepe/download_aplikasi_murottal_alquran_30_juz_offline.pdfIn PDF document text
- https://s3.amazonaws.com/belapawerezuju/supply_chain_management_resume_format.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4078ba3a-0ada-463a-b0c4-d57ba09a389f/hp_deskjet_2132_all-in-one_printer_driver_windows_10.pdfIn PDF document text
- https://s3.amazonaws.com/zurovajij/b_wings_game_free_for_pc.pdfIn PDF document text
- https://s3.amazonaws.com/sigobija/ar_rahman_movie_list_tamil_song.pdfIn PDF document text
- https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_922383e4a13149329a43d1a8e1e554b4.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/728acea2-12d4-421a-86a8-00e4e0bd2f60/how_to_use_humidifier_for_plants.pdfIn PDF document text
- http://xuwomotibinifen.rf.gd/48321448708.pdfIn PDF document text
- https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_bd701321af814c3aa0ea3b770b28107c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE16	5032 bytes
SHA-256: `42f2ffe69b70593297af0b4cb0c7cf94c2ed169e0f65dbd12063ce959ab85a52`
`font_01_sfnt_off0000ff31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF31	10776 bytes
SHA-256: `080731f1eebbb602c0a3d4808621f7fd662d787d59d4de5906b19252bd884de0`

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