PDF malware analysis — malicious · e04c1dbcbd779330

MALICIOUS

PDF

78.3 KB Created: 2021-05-20 04:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: c4c879db57107e3b69e37d99febae0e1 SHA-1: df32b1bbf4c052870504e43f02a663660875ffdd SHA-256: e04c1dbcbd779330ccd9b0c6c6ff982bb860a53d82575a3846d1f51d7560af18

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a significant portion pointing to SEO-optimized redirectors. The primary malicious URL identified is 'https://dugedepap.ru/strik?utm_term=paper+boat+origami+template', which is likely used to deliver a malicious payload or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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
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://dugedepap.ru/strik?utm_term=paper+boat+origami+template PDF link annotation
- https://dugorokibo.weebly.com/uploads/1/3/4/6/134651225/d94edc37b63.pdfIn PDF document text
- https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/8540155.pdfIn PDF document text
- https://givadebar.weebly.com/uploads/1/3/1/4/131437750/vuvat-suwele-fomaragorilolu-wofawokikabone.pdfIn PDF document text
- https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/9831963.pdfIn PDF document text
- https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/9693848.pdfIn PDF document text
- https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/janozovulot_rogogudoxi_jewunisi.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/lanubili/annamayya_cinema_audio_songs.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/75eaac1e-5bd1-405a-8c44-cb9f02204f30/which_book_is_best_for_maths_class_11.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/40deeabe-f40e-4649-a8d6-1879fb8914e3/39323851997.pdfIn PDF document text
- https://s3.amazonaws.com/mujevubutukoxu/40679649510.pdfIn PDF document text
- https://s3.amazonaws.com/lixasifasi/92202359153.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0651ac13-02cb-4b40-9eaf-46cadcfaedb6/how_combined_cycle_gas_turbine_works.pdfIn PDF document text
- https://s3.amazonaws.com/julexekubaj/xebatesesoxagov.pdfIn PDF document text
- https://s3.amazonaws.com/dotivaf/50124201615.pdfIn PDF document text
- https://s3.amazonaws.com/geraromu/62618079499.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/194a0160-6603-435a-99f7-8846d14632d0/dnd_5e_backstory_generator.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f9195af8-02ae-49d6-919e-e41d815ba0cc/gufozafov.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/65973185-e870-4b06-bc96-49310633aa10/sotisebokuwatasufepo.pdfIn PDF document text
- https://s3.amazonaws.com/tawovojo/sat_answer_sheet_scanner.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_off0000e8e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8E2	4784 bytes
SHA-256: `b6bfd45d46a019470915782a1938dedae06010fece56baf19b1cc7a6beda7ee0`
`font_01_sfnt_off0000f923.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF923	10792 bytes
SHA-256: `138b9d6e72dfe9680a5da8f664f824adaec543b9010eb0dacec155fffdf5d9f0`
`font_02_sfnt_off00011dec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DEC	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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