Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b1b652ff05c3db…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 12:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9f65ebfc414fb6cdafb23d141493ec4 SHA-1: a9cc4ffb1e383067c398444e67f35a2d2b777668 SHA-256: 81b1b652ff05c3dbdd422bd694ba8d8d939c1a7f76561e6e6e99283f977fc50f
156 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 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 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://crophysi.ru/strik?utm_term=stand+by+me+song+cover+versions PDF link annotation
    • https://zilonuxe.weebly.com/uploads/1/3/1/6/131637529/8954790.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/c6cdd1ca.pdfIn PDF document text
    • http://sinagibopugapaz.iblogger.org/rasef.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/peluxa-xifogof.pdfIn PDF document text
    • http://vukabuv.22web.org/bopovinarixozigamilol.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2797421.pdfIn PDF document text
    • http://ginajazadunoxix.22web.org/harvard_referencing_generator_online.pdfIn PDF document text
    • http://xigotazuwal.iblogger.org/rental_agreement_template_residential.pdfIn PDF document text
    • http://carbackseat.site/rofawiponogx1lng.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/bokexizometun/lupisakigeloved.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/sexatipurazeb.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/what_is_unconformity_in_geology.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/children_s_joined_up_handwriting_sheets.pdfIn PDF document text
    • http://pubexet.rf.gd/tatami_bjj_gi_size_guide.pdfIn PDF document text
    • http://wowawese.rf.gd/duzonunizirifuloguvuna.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/arteries_and_veins_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/firestore_android_kotlin.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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 5632 bytes
SHA-256: effc90695a581b51c2d8f8821d0c7303ef1697809f401869c60b6e5d0f1f9065
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 10628 bytes
SHA-256: ef8cbfbb7935ce2fafe599970c9534a1b76a50092925955c16896dec5bd18c22

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