PDF malware analysis — malicious · 79c9f24ff0f68bc6

MALICIOUS

PDF

91.9 KB Created: 2021-03-29 19:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 653f788a39d54ae823e5fe3e39753603 SHA-1: 2606ef415b2036f623ce37d48232d954e5f80095 SHA-256: 79c9f24ff0f68bc6f4a261fb2ce45c9196005fc1a03027bb4be11db74b700e84

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent link pointing to 'golowaki.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://golowaki.ru/award?keyword=statistical+modeling+in+pharmaceutical+research+and+development+pdf
- https://cdn.sqhk.co/rezeribevi/jcvhoid/85326763768.pdf
- http://vivetosatirora.iblogger.org/chapter_4_test_the_organization_of_life_answers.pdf
- https://cdn.sqhk.co/rufebumu/dFKEhji/35718526576.pdf
- https://cdn.sqhk.co/xarobumevux/XhdR9ig/wesipu.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/49d66ecf-391f-4dd5-9433-adb8a75c1b24/muwidukuwuporesapom.pdf
- https://s3.amazonaws.com/dotivaf/radojazametuma.pdf
- https://s3.amazonaws.com/tapelu/what_is_a_project_cutover_plan.pdf
- https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e591aa1d53604f4e958215b45511a9f1.pdf?index=true
- http://didaledagaxuz.rf.gd/deed_of_sale_land_format.pdf
- https://s3.amazonaws.com/mipeboro/sejorasexoga.pdf
- https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_83dabe6fc4f0411688a16066d6dce248.pdf?index=true
- https://uploads.strikinglycdn.com/files/d0baab6f-6757-4632-b5a9-1ead387e1b3f/56436637074.pdf
- https://uploads.strikinglycdn.com/files/7de9511c-7920-474b-84f2-3cd808f7f4ce/fozupuxutenixuvobawitado.pdf
- https://s3.amazonaws.com/fodose/sorupezereligixupolaz.pdf
- https://s3.amazonaws.com/wofaxil/leadership_secrets_of_attila_the_hun_by_wess_roberts.pdf
- https://s3.amazonaws.com/jazuravazaguz/desco_wrist_strap_tester_manual.pdf
- https://s3.amazonaws.com/nigimul/ap_style_quotes_capitalization.pdf
- https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_b2e0ee6864c84876bb95cc1c073c79b4.pdf?index=true
- https://uploads.strikinglycdn.com/files/05b10e5a-10bc-4001-8627-b67a27bb7a8c/jidixesigawasebofedelepod.pdf
- https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_0a01be1a1a3f4ee5830acf441a9ff073.pdf?index=true
- https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_13fe9de54bae412888825ed19ac82c5a.pdf?index=true
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001274c.bin` `5b268b194dc456e68704eaf854007e2a2b75f72564c967d150407120961a32ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1274C	5732 bytes
`font_01_sfnt_off00013aab.bin` `ef1d793dab1f44c6010c5ce1fc3615331870ce20797da37e64a11a369ca695ed`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AAB	11528 bytes

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