Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f59af148cdf72eb…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 07:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8968b5a742a2e27aa2b3cdf4533cbcea SHA-1: 24e236dabe4bb55bd762a1b4514c15e4e9f408f3 SHA-256: 6f59af148cdf72eb0119d3b9fbb8d94a0298f208b431c53582a06a649f7568fa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URI heuristics point towards an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=handboek+bouwbesluit+2020+pdf PDF link annotation
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/89abb727c5fe637.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/00beb9ea.pdfIn PDF document text
    • http://wowitaly.space/what_is_the_meaning_of_development_in_geography1uhnv.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/zusagigunedaf.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/gakajinunogakigudoliguwug.pdfIn PDF document text
    • http://fortuneo-enligne.com/frogger_2_gameboyxa67c.pdfIn PDF document text
    • http://clobuss.ru/anari_video_hdmoumm.pdfIn PDF document text
    • http://teenagetutor.online/terififafeb2ki83.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/f71769fe-a27d-47b6-9c8f-3eb770a4dae5/zafawabuxisenok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb44478e-4cd6-459f-ba7e-bc3294e08f9b/how_to_write_an_analytical_report_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffca7be-b389-4057-888a-6d35982c5505/christmas_song_somebody_snitched_on_me_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4835332f-295a-4397-b7ac-f649b337a681/64800730217.pdfIn PDF document text
    • http://tobekiginekafo.epizy.com/8777432574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578fbbbd-6a1b-44ad-af86-c44a8d68db5e/gledai_indiski_filmi_online_bg_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b357ce1-e67e-4dac-a636-fabf031e5082/ascend_the_hill_hallelujah_what_a_savior_bpm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d189a2-6bda-4a85-8276-eb105e4b6d35/69913556438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80b2427-a114-44cf-a9bb-f520502fe231/83886977533.pdfIn PDF document text
    • http://xikisefux.epizy.com/dubutofugiv.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.

FilenameKindSourceSize
font_00_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 5468 bytes
SHA-256: 17110ee4fa24d51ea57666723bc42123687aae33ef6d5e938934a6151424cb04
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 12736 bytes
SHA-256: 06cb825d4fa80a95779b9a160da9429fdf6c1b51833cdc2eab3f1ad096f327cc

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