Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd91260b43a2e2d…

MALICIOUS

PDF

73.2 KB Created: 2021-06-02 02:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 07033f7e026c649c1e2bdf38dd8ebe13 SHA-1: 8a1b8009ced5b49296ea25a9cc95ab0b3eca5b47 SHA-256: 3dd91260b43a2e2d2ae397178ab1a56055fc9701e4f65a999e86064677d9de52
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=what+does+316+mean+on+jewelry PDF link annotation
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/7adcb4edf2198c.pdfIn PDF document text
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/5599864.pdfIn PDF document text
    • https://jojonawizofobu.weebly.com/uploads/1/3/1/4/131438175/rizekujejunigu_tofozixu.pdfIn PDF document text
    • https://lukobojamema.weebly.com/uploads/1/3/4/3/134317851/bexexefelosesitipof.pdfIn PDF document text
    • https://nunifabemavi.weebly.com/uploads/1/3/4/8/134871907/kenex_kusanadoxo_bopabirojovemi.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/61e2eaf2-cdb4-4272-abba-bcd63df040a1/44165364782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca2e736-e626-45de-a735-09a7c4948a41/66304690818.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/53282086227.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144470067/fiwodewapodazato.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414495/82554640604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e769d258-a5ec-407e-8f1e-8bd6416604bd/what_are_some_examples_of_chemistry_in_daily_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bf78aa-b06a-4609-9bad-470a56d9db2b/husky_1550_pressure_washer_parts_diagram.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/16394408146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fed485-587d-41b1-a877-2e9c7c53e9fc/how_to_descale_a_rowenta_perfect_steam_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5583eb-f79b-490e-85ce-85e018342416/35455915714.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144428118/a_writers_reference_with_exercises_9th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a317bf-6d5b-4b39-9852-7be8b2e593f5/zalifibob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b217fdd0-46c8-4d87-9a49-e5839c4ed253/how_to_clean_abu_garcia_black_max_baitcast_reel.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 5716 bytes
SHA-256: c2e37e572e0d2a6fa0684477cb8d39bb05ee2f110132ed81041b4ea52c5a39ce
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10264 bytes
SHA-256: 2a3af62626b18a9f7ba07e6a25e945c94aa43ccb43da1dad570fa49f35765724