PDF malware analysis — malicious · a74b83fbd7726d5c

MALICIOUS

PDF

75.5 KB Created: 2021-05-20 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 706ecbbcb1c9916cb8d2d1008f5e13cd SHA-1: 952df9e403d33adbd04fccafcfe4facd41bd3ea6 SHA-256: a74b83fbd7726d5c2ece849a84f0bc6bcbf6a2bd8b3bba12c19ecf00a92f3c79

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to what appears to be a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://druttle.ru/strik?utm_term=how+to+get+atomic+clock+to+sync, suggests a potential phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score strongly indicate malicious intent, likely related to distributing further malicious content or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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
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.
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://druttle.ru/strik?utm_term=how+to+get+atomic+clock+to+sync PDF link annotation
- https://cdn-cms.f-static.net/uploads/4413867/normal_601cfd09c65fc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450259/normal_6038e172008e5.pdfIn PDF document text
- https://juleverut.weebly.com/uploads/1/3/4/4/134488806/3047065.pdfIn PDF document text
- https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/tinubenekit.pdfIn PDF document text
- https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/witomorodob_lasivemopu.pdfIn PDF document text
- https://pokukumujipuk.weebly.com/uploads/1/3/1/8/131856200/dozaposuki_mujeruk.pdfIn PDF document text
- https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/6222874.pdfIn PDF document text
- https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/6670697.pdfIn PDF document text
- https://lewisenoj.weebly.com/uploads/1/3/0/9/130969481/vamezovidubimupobap.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/fikuvine/bujitosiwutusapajar.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4e4efa2f-a106-4417-bbce-78e25ccb1ead/aprender_ingles_en_7_dias_ramon_campayo_descargar.pdfIn PDF document text
- https://s3.amazonaws.com/xukonakefules/ableton_9._1.pdfIn PDF document text
- https://s3.amazonaws.com/voxipanovigepiv/xomimewitepovalomef.pdfIn PDF document text
- https://s3.amazonaws.com/nonipesikiri/birthday_images_for_boyfriend.pdfIn PDF document text
- https://s3.amazonaws.com/xixonu/games_2018_new.pdfIn PDF document text
- https://s3.amazonaws.com/xugigabitulu/23064983040.pdfIn PDF document text
- https://s3.amazonaws.com/lixisariwulo/torugoxoruvuwovegiduvowex.pdfIn PDF document text
- https://s3.amazonaws.com/davubewu/access_consciousness_manual.pdfIn PDF document text
- https://s3.amazonaws.com/ritoma/codycross_answers_group_259_puzzle_4.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c2682a46-c4d1-46df-9e40-ea2842c6c930/10896724276.pdfIn PDF document text
- https://s3.amazonaws.com/jozaponi/lonely_island_jack_sparrow.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC2	5240 bytes
SHA-256: `042aa26855ce10faaa189eba03278422b9ea5916e80d8aa29046c03d3e10b66d`
`font_01_sfnt_off0000fea6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEA6	10324 bytes
SHA-256: `2db0c104e928ada32ec85158ad2d804f210176608c31384908d2a56127b26e3c`

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