Malicious PDF — malware analysis report

Static analysis result for SHA-256 908129753ac3b2d2…

MALICIOUS

PDF

106.0 KB Created: 2021-06-13 12:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 21d1216cd54e293c9adb73d713cafb75 SHA-1: 07fba5e9480d3cb4da282d8a8b24ff80c61ba3a5 SHA-256: 908129753ac3b2d2d51ae84e08c4d807e893836abd621485c0bb98cfdf2bfefa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'dugedepap.ru'. The presence of multiple external links suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://dugedepap.ru/123?utm_term=normal+follicular+study+report+on+14th+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392191/normal_60192c1784f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_600b8d1846891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_60446a43cb366.pdfIn PDF document text
    • https://zagumukukawikam.weebly.com/uploads/1/3/4/6/134608037/5227477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_60609728e6823.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/juloze-gikadijilofujo-luzen-balutovilezazib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60220b2198880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fe2d344e93e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5fc8a9ca73ea2.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/vofofukifipuzex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_606e688fe1010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6061cb18b5013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6011b8b35f015.pdfIn PDF document text
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/xurorowixo.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/d0fa7d5d-abd2-411d-8b65-8b732b864574/15714675939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe696e04-62e2-4927-a3fc-d09009c3a073/xopuzidag.pdfIn PDF document text
    • http://jamexapageku.pbworks.com/f/derinenirasegotadaribu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1b8166-fa56-4384-9380-5507cd8e5a17/how_to_change_mini_maglite_led_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6d4bfc-1990-4d46-bba9-c02cb1b6fee6/fizujekudikazesek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc73f9c-9586-44aa-bc21-98d91d802c2b/sapatosozuzufegutigavo.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/rumivufinerafifamitafuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5086239-e199-4d4b-bbbd-60f1b742bf04/58793625912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c745cec2-8fbf-4acd-a339-0a0c09163286/bolafufisu.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/bepozajogudiwuzina.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/42892107471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08310637-05ae-46ba-bc1e-c6bca9055e3d/pioneer_sx_780_specs.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_off00016134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16134 5604 bytes
SHA-256: 31b8bd1e07eae1647475d7df3c04b5cccce4d0d810dfbdac355f1797a8250be7
font_01_sfnt_off00017432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17432 11008 bytes
SHA-256: 2e5ef9693c2e3efdba2a0de804647a2f14abad38c849b1466ed4ec6a1dfb2c20

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