Malicious PDF — malware analysis report

Static analysis result for SHA-256 444703c5bf6497a0…

MALICIOUS

PDF

79.7 KB Created: 2021-04-06 18:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5a1128e69f5cce6d49763d2c560aeb SHA-1: 9aa8f50563347f1d2aa7587a77f70ae4a3dd5b63 SHA-256: 444703c5bf6497a0a434cc32cbd60c27c790aade24b2fc8bd66801b3c70b76ba
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is a PDF containing a large number of external links, potentially for SEO manipulation or phishing. One extracted URL, 'https://lozipotod.ru/123?utm_term=outlook+signature+image+format', is suspicious and likely part of the malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/123?utm_term=outlook+signature+image+format
    • http://doorstepcomputers.com/xadusi8gxxr.pdf
    • http://getporte.xyz/excel_2013_vba_tutorialg0c6r.pdf
    • http://mugipojezekegul.iblogger.org/pojafobajaduzusibef.pdf
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/f40074158ef78ac.pdf
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/41f2be0530.pdf
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/6bc49.pdf
    • http://cozyplacefor.rest/fezulegisexabaramo1d8ef.pdf
    • http://zumodaronomana.iblogger.org/94775992217.pdf
    • http://prodit.space/8964852484lv8s0.pdf
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/46ea3e3a.pdf
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/rakapixilawizaj_rugev.pdf
    • http://copyrightprivacy.site/how_to_connect_uniden_phone_to_baseny9y6.pdf
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/genizix-dapixulemub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef7bb23e-48b5-4f19-9a86-4e040017c07f/what_are_the_major_functions_of_administration_and_supervision.pdf
    • https://uploads.strikinglycdn.com/files/9a30cc88-8bb4-4b88-a7dd-17f2f98611c6/questions_for_retail_supervisor_interview.pdf
    • http://modujufuwalali.rf.gd/wedufenemabalunolit.pdf
    • https://uploads.strikinglycdn.com/files/37434dbe-e796-41a1-a852-046032f0b85a/average_american_income_per_person_after_taxes.pdf
    • http://ronolajume.epizy.com/75376940802.pdf
    • https://uploads.strikinglycdn.com/files/94ede853-e16c-4fe7-90b9-2c8313edce9d/why_doesnt_my_roku_remote_work_anymore.pdf
    • https://uploads.strikinglycdn.com/files/ccd284c4-2bcf-4c02-b38f-ad981149e212/what_is_another_word_for_days_of_yore.pdf
    • https://uploads.strikinglycdn.com/files/e8e6c1c3-a00e-48bc-b2df-3c2b76e536f2/6988391061.pdf
    • https://uploads.strikinglycdn.com/files/252a97fe-ad10-46f2-87b3-7600a295a2cd/exploring_psychology_in_modules_9th_edition_download.pdf
    • http://guxonijelosaku.epizy.com/the_shack_near_me.pdf
    • https://uploads.strikinglycdn.com/files/75d02950-3116-4031-be8f-34ea42637e27/51425541098.pdf
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000f9cd.bin
f773809af4b2135689c61d9c1e6be9e082a644451080526006bddbbbb28afc03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 5180 bytes
font_01_sfnt_off00010b5b.bin
f46caa35d69cdc44b92e8d78fe1591cfa335c5344ca277d272e31b2d8aa2fab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 10572 bytes

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