Malicious PDF — malware analysis report

Static analysis result for SHA-256 086d235ca0ca8105…

MALICIOUS

PDF

104.1 KB Created: 2021-03-14 23:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d6a59ae6fdd4484fce7301b166de55 SHA-1: 7964c40228f40b1cdbf2ef5733bd2e57af93ea25 SHA-256: 086d235ca0ca81059eb5d39f711b47937175665d4222868b4d33f37194c81e1e
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one pointing to 'xajibur.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a study guide, aligning with spearphishing tactics. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/wix?keyword=stamped+from+the+beginning+study+guide+pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/lovufibezadejesi.pdf
    • http://hightrade.club/the_complete_glycemic_index_gi_food_guide1xxj5.pdf
    • http://afracheat4.xyz/504145019450k7fp.pdf
    • https://jubitire.weebly.com/uploads/1/3/4/0/134017652/10c78.pdf
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/newukad-refema-gonibexikani.pdf
    • http://ilkertr.shop/11324293867jbn5j.pdf
    • http://hookup154.space/language_leader_coursebook_answer_keypqafo.pdf
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/mewodujuvemajo_siwafibi.pdf
    • http://dexaputanit.mygamesonline.org/burial_rites_in_nigeria.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/03db478b-4d75-47fb-b5ab-34b85e2fad57/jedefigetikivenusam.pdf
    • https://uploads.strikinglycdn.com/files/b1949de1-7fa4-4fdf-bd09-e8a0c141efbf/nespresso_usa_machine_plan.pdf
    • https://s3.amazonaws.com/wujapu/buzijisapofital.pdf
    • https://s3.amazonaws.com/muvarelo/24377899828.pdf
    • https://s3.amazonaws.com/bikikanafopavu/58333270751.pdf
    • https://uploads.strikinglycdn.com/files/fbbf9633-7c35-4b9c-8057-0f3d96defb9e/nebidulokeziwezekutinub.pdf
    • https://uploads.strikinglycdn.com/files/357c8f2f-8313-4226-bded-6ad96f3450f7/paxod.pdf
    • https://s3.amazonaws.com/bivanud/john_deere_la135_belt_replacement.pdf
    • https://uploads.strikinglycdn.com/files/7050101d-d73f-43a6-9756-63837d6845b0/nancy_drew_season_1_episode_14_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/619a67c4-3d9b-4d56-b1e3-69cd7199ff86/94562854066.pdf
    • https://uploads.strikinglycdn.com/files/7fc697dd-ad76-4a01-8971-aacad8ed698c/kerojesofoniwor.pdf
    • https://s3.amazonaws.com/jalasilunaz/zizivi.pdf
    • http://puribisipup.atwebpages.com/entrepreneur_usa_magazine.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_off0001567c.bin
ab4cf18db82e9f7f5c69f7b003709fa0cbadd35075cf65d5e74a1f3c74df9710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1567C 5768 bytes
font_01_sfnt_off000169fa.bin
26a555b22a1f78f2678468dfc3572bf9505406127c245b678039928cf3d821b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169FA 11724 bytes

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