PDF malware analysis — malicious · 8cf3a611099ae94f

MALICIOUS

PDF

97.3 KB Created: 2021-03-23 14:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: cda61abfe79b958206db5019d096e2da SHA-1: c9d46e384290157f14cd9eae2d58f11ec0c79ff5 SHA-256: 8cf3a611099ae94f3fe27e8df73f0804f8a72d55f60a3b90f078624d546a164e

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=how+to+do+algorithmic+trading, which is likely used to deliver a secondary payload or redirect to a phishing page.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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 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://seumenha.ru/strik?utm_term=how+to+do+algorithmic+trading PDF link annotation
- http://tozofuji.scienceontheweb.net/rig_veda_book_in_tamil.pdfIn PDF document text
- https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/3490467.pdfIn PDF document text
- https://cdn.sqhk.co/wodigajamu/I2Yhcgf/fuxitavuxizekirix.pdfIn PDF document text
- http://jesawukimefix.mypressonline.com/42230116289.pdfIn PDF document text
- https://veliwomi.weebly.com/uploads/1/3/5/3/135343105/4053374.pdfIn PDF document text
- https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/tozapozazakazokavema.pdfIn PDF document text
- https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/funiza.pdfIn PDF document text
- https://cdn.sqhk.co/lupobikud/xghjaRV/slasher_scream_scary_horror_escape_games.pdfIn PDF document text
- https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/8442588.pdfIn PDF document text
- https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/0b25bada1717.pdfIn PDF document text
- https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/gixakusukivojor-mitiwija.pdfIn PDF document text
- https://cdn.sqhk.co/talurelope/F3jefhf/16282657679.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/fukepez/fatopazavuwexosenul.pdfIn PDF document text
- https://s3.amazonaws.com/dukavunivifa/blank_political_map_of_europe_worksheet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/178809ed-154d-412d-ba52-681e2c72ce64/can_popcorn_tins_be_recycled.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9adff150-d4b2-4088-b42a-6a5e67474422/wivaloveguluzesufobezapoz.pdfIn PDF document text
- https://s3.amazonaws.com/zusevamasor/arabic_calligraphy_fonts_microsoft_word.pdfIn PDF document text
- https://s3.amazonaws.com/fonazuzixagizir/65857014313.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/63fdb5fd-7e09-4252-ac3b-5734d678a8fe/12811911274.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5cd08006-f4c7-45b6-bb9e-2a50640ae353/pro_97_scanner.pdfIn PDF document text
- https://s3.amazonaws.com/xukonakefules/how_to_join_the_australian_navy.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f6942f01-21a9-42a5-911f-ff6e337f8537/cissp_study_guide_third_edition.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_off000130e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130E4	2996 bytes
SHA-256: `fd7ca904a086d7e4d4549ff606d429cf8a246d475548939133b0259e316ca2cc`
`font_01_sfnt_off00013ba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BA7	5228 bytes
SHA-256: `4f0239075f70093c2ca38d3153abc9b416e8c86e7b1953e7b3833cb1197c6134`
`font_02_sfnt_off00014d51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D51	11840 bytes
SHA-256: `94226a22d572f71ffa36e7fe88dfdbc6e395b51b14effc7a3d2cc99c7e5a085d`

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