Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af43652d55fa2d8…

MALICIOUS

PDF

83.0 KB Created: 2021-03-22 11:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28210690cef0f3adf32b7b5fb35a73eb SHA-1: 6285b81b87f85c0e8452d7a320c7b246ae6fd00b SHA-256: 1af43652d55fa2d8540ad35e3623a6734cdae58fa124530a9fc2bff271858ec9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=beach+buggy+racing+2+mod+apk+android
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/pagexakopeli.pdf
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/5bc71e.pdf
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/tasutokob_pusubaw.pdf
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/gesup_zikulamilop_dogoro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_522f25bed35c462ba48b5c24d400c3bb.pdf?index=true
    • http://vokulokunupada.epizy.com/bully_anniversary_edition_apk_aptoide.pdf
    • https://uploads.strikinglycdn.com/files/e903bc55-33aa-408c-b314-a72e8d8c59ef/31411668532.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_869ba44d82a245c1a2b15813978f4c51.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_c15183b078364b00b3d9a63378aa2359.pdf?index=true
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_401fc14417bd41c78a70d77ab2119f59.pdf?index=true
    • http://vewetumizobu.rf.gd/kifedolasobomorosigo.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_e7ffcfde23f048cabdc1784e457f5777.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b9f2997-40f6-4987-824a-b3dff16ac850/what_are_good_trivia_questions.pdf
    • http://nazowovemozugiv.myartsonline.com/24061345162.pdf
    • http://suvowafavij.epizy.com/tombstone_arizona_travel_guide.pdf
    • http://lobopekogolo.onlinewebshop.net/washington_state_mens_basketball_score.pdf
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_dd2add03502a493088719871fcdb9c38.pdf?index=true
    • http://gunitolowed.rf.gd/84684144019.pdf
    • https://uploads.strikinglycdn.com/files/eca41f00-e75d-43a8-b5cf-fb36e8ddd418/tepadolejesepapajuzibuza.pdf
    • http://wazewatiduxuz.epizy.com/sap_abap_on_hana_tutorial_point.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_off000102c7.bin
ed40eedbe02edbee4012394b45a23215b3bb39183b1c7988f605084000eb3579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 5764 bytes
font_01_sfnt_off00011646.bin
95bbe8c1b14d2d948061920928b54168e944b4d0feade43d4d102d2a7ca2d0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 12348 bytes

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