Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f34c66f4abacd3…

MALICIOUS

PDF

121.7 KB Created: 2021-03-21 00:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb42d17e9acccf2de4ae83f0ea7f44fa SHA-1: 720bc457a2507681cd9131fe84bf1a2b1e0680b4 SHA-256: c0f34c66f4abacd3e17bb0e026cee1e5bdf7186a66df75903ced5eba4ac6f123
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/123?utm_term=footnotes+referencing+guide PDF link annotation
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/logapixufow.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/sajijubaxopi.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/best_spoken_english_book_in_tamil.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/applied_mathematics_3_book_for_diploma.pdfIn PDF document text
    • https://bijafifevidajun.weebly.com/uploads/1/3/6/0/136051066/barul-rodixujeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/consumer_reports_air_purifier_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c232db5-37e1-435d-a202-e5c71389b25e/82957700305.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/seoul_subway_map_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c400588-6d18-49a4-8987-f47537062ac4/21746002029.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/10358150085.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_2e5e2d7a4c584955a6d32f794969e7e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/what_slows_gi_motility.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/48171595893.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_e605dc58bd2041e6b93e527277ed2a0e.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_d13b08adc9964486a87f18498df6331e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a9ab7d-84d8-4ff6-b3d5-7df2c9c4f039/pafuleviminepi.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/28292091953.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/meningoencephalitis_treatment_guidelines.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_ac004d3d94b1402aa18514c8098d21bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/74377940601.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001861c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861C 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off000190aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AA 4904 bytes
SHA-256: 36a22dfa91c24fc69459bbc33a22e3cc7f96ff120df0fe3b2c7d12e7115ac2d8
font_02_sfnt_off0001a162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A162 2148 bytes
SHA-256: 3156734b8d8ce36ba3507336494b11dfe307b73b5267a53eb0ffb3984767a315
font_03_sfnt_off0001ab1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1B 13792 bytes
SHA-256: cfb3ace473c002169443e3ed817b4d0709d05fd0bb1482d9e48030d5ca4234e7

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