Malicious PDF — malware analysis report

Static analysis result for SHA-256 c415d30d9c5c11db…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 16:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a8559ac0c0b9cc9b2b41df6e0a977dc SHA-1: 71a88c575f3f366c31e5eb00215036bc9125c556 SHA-256: c415d30d9c5c11dbeb0c5f3e29d4e38abacd6f6baf97cdb8bba9aa6d60443905
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, containing numerous external URLs, likely to manipulate search engine results or direct users to phishing sites. The presence of embedded URLs further supports this, suggesting the document's primary purpose is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=benim+hocam+video+ders+notlari+pdf PDF link annotation
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/voxalurarolejag-mozukuwisogeruk-ketowadib.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/801f28.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/45153215249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_48864e07848442dc863a3ddfa363d082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4658ab9-6c39-4b63-bb72-c374f8ed699a/can_i_charge_my_garmin_while_running.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9740b791-a2f9-429c-a636-2d50f55d8440/how_to_write_a_novella_in_24_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/noxivepanivubetumezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cf2b93-d768-412a-8407-92d38074e4cd/do_ws_look_bad_for_medical_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a962fbe2-9081-4bae-90b2-c4d74a58f22b/19964069919.pdfIn PDF document text
    • http://suwiwozeko.rf.gd/32489555119.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_4388fe9788704c518b692a8e70ed7c0b.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_fb619dde006345a29126e11a5537d9af.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_942c9b473c4e4afbbc17769af0eeffd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/276f0e5b-6b14-4e48-a34e-2e5805706e3d/sinopsis_film_the_hunger_games_mockingjay_part_1_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5f2d8e-8378-498c-b968-0f6c7d2a8d65/repezutomiwatapexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e03ef96-6ba3-41f1-92bb-87a17e7c032b/napimatoxolawov.pdfIn PDF document text
    • http://xopizoxixinida.rf.gd/kidopemukalopukamuw.pdfIn PDF document text
    • http://zikomum.epizy.com/42705830363.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/alone_together_tagalog_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8980d1d-a219-4911-81a4-4465f61ca34c/irobot_roomba_530_battery_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960d7efb-f1e2-4820-a98e-37d7fb4bdd6a/53974891807.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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5504 bytes
SHA-256: 65d07e722464d15f062bcf67181912896c9872b6eb0e82541dd68da5f6650338
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 14432 bytes
SHA-256: 190786d21cf3f095f266ef6761a00eb154eb2e8bface5396a9417ddbb7d397d5