Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b12938fc599edca…

MALICIOUS

PDF

81.6 KB Created: 2021-06-04 17:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 904f63c74150f6e4102d654e7eb2a06d SHA-1: 9c36c776e09f56957d099236f206211a7dc11348 SHA-256: 7b12938fc599edca0f1a128e8ce613823daed15eed31e479cbd5b156a933d6d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=astronomy+101+lab+answers+csi PDF link annotation
    • https://bawekiseboluxis.weebly.com/uploads/1/3/5/3/135327810/ketazutazulakasu.pdfIn PDF document text
    • https://wajogivetiwi.weebly.com/uploads/1/3/4/3/134322864/kozadipiriji.pdfIn PDF document text
    • https://wesudami.weebly.com/uploads/1/3/4/8/134881188/e05dc93f0f06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_5fd054ee332bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_606177df620b8.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/nowenagom.pdfIn PDF document text
    • https://juxatameserog.weebly.com/uploads/1/3/0/9/130969062/8201664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481821/normal_60076943af7f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425385/tukulula.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415863/59019903479.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/baloliwivari.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426171/32749882618.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/goodgame_empire_hack_download.pdfIn PDF document text
    • http://junerew.pbworks.com/f/jakevug.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/mexexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f563d34-15a2-4e4a-b645-a255b778f777/90991668016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110648bb-b3f4-4c45-96ff-2f00a35b1818/5355609920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33abc68b-9139-470e-a46d-05d1dbb893dd/la_biblia_hablada_reina_valera_1960_libro_de_mateo.pdfIn PDF document text
    • http://favixose.pbworks.com/f/abitha_diyani_episode_102_dailymotion.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/27128764377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbada3ba-cfda-4ee5-9c4b-27caf053c39d/how_much_does_a_mechanical_engineer_make_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83370e98-2251-45fc-8134-ffb54be612d6/92252595805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8f343c-895d-446c-bab4-8df727edfeda/last_of_the_mohicans_1936_filming_locations.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_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 5460 bytes
SHA-256: bf1296eef93b02e1742131b6f0c7d47303a005bd2ea03e352a33d0b4c9b11024
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 11176 bytes
SHA-256: a993a704af86b0e27c5debada2080792d94f742878d77c7f74db43fc8816b1fe

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