Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb5bb281be7d0ea…

MALICIOUS

PDF

79.4 KB Created: 2021-03-03 02:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 926e8bfe4672a937710137e8eb8721c1 SHA-1: 50db0d11bec9704c7a9a76c2ecbba96dc5b6bd75 SHA-256: efb5bb281be7d0eac8582ba0894f1a2e69595c1470192929b08b41e553067210
186 Risk Score

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 0.9998

Heuristics 6

  • 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 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://xajibur.ru/123?utm_term=let+teenager+try+adulthood PDF link annotation
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/bazarejefofag.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/wovubisapavepu.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/wisdom_of_solomon_5.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/nujanasotulazalikolo.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/how_to_become_a_commercial_real_estate_broker.pdfIn PDF document text
    • http://artemk.ru/monster_truck_show_melbourne_2020ijxtu.pdfIn PDF document text
    • https://sajawibur.weebly.com/uploads/1/3/4/6/134631073/fapipa.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/3174543.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/muzotevutam.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/d173923e6655.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/67f2a69edd1e83.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/zesolitemibevamu.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/soxunotove-gipul-lupile.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/what_frequency_is_the_flower_of_life.pdfIn PDF document text
    • http://premial.su/how_to_tell_if_you_are_right_or_left_handed_in_golfxx2l6.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/7854b657b.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/99684467391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikubub.onlinewebshop.net/tu_eres_digno_de_gloria_gerry_marquez_letra_y_acordes.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/wotitupodusi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 4952 bytes
SHA-256: 86174a7f3106267c9a468c39f19db7e113b697f591b79fdb4e55378ef8a2dbb8
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 10496 bytes
SHA-256: d670a6ec15ecf206f814ffe414e1a7dccfd9efbaf0bede9e01a4d62f9bb4b4f3

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