Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fb7d11e3594b1d…

MALICIOUS

PDF

74.4 KB Created: 2021-05-23 17:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 862312009d6819143b6849d21bdb2c75 SHA-1: 6a49b1dd6a6a2f3ab6de1ae6dc5b0b04d1b01573 SHA-256: 11fb7d11e3594b1da8eecbc1a5f1863ce157e4f80abdb97df75c7e0426b2fa6d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links for SEO manipulation or to distribute malicious content. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=when+to+upgrade+to+th8', is flagged as unknown reputation and is likely the intended destination for malicious activity. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=when+to+upgrade+to+th8 PDF link annotation
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/9422837.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/bejijumukakix_tivorizi.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/diwitapezu/idsa_guidelines_c._diff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a500b4-2732-4462-a3eb-9aef07bbe539/why_is_my_whirlpool_duet_dryer_not_starting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e3dd42-d5b2-4928-8a34-00d895e616f0/what_size_tires_jeep_wrangler.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/subject_verb_agreement_worksheet_grade_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c392c286-7951-4aad-9cdb-7cb8cd853541/62789321972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53046703-1f40-4227-a161-7735153e29c5/dadikadagalozevarelazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658d3d4a-47d3-4fba-9c72-fdf427649d9c/2006_bmw_330i_blower_motor_resistor_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c85fcdb-842a-4c31-86c3-dc552b8427e1/30995234307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a122df7-dd43-4dc3-801e-e2829f0d8841/76138958702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d899ca65-4441-472f-8141-d01d6c6163d8/14433548777.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/36253707951.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/guns_germs_and_steel_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bd687d-2e60-4a47-a50a-52bf75dfb3ba/faraditagejuxukazida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8198c21-4b38-49aa-ae40-627fa47955f7/tixes.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/bashment_riddim_by_dj_lyta.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/navon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136ada54-3792-4e87-9bbc-d56a2d191f0d/wotujizaxek.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/verudusazabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927b6dcd-ae6f-4c2a-b513-6525541da970/why_dont_my_desktop_shortcuts_work_anymore.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/cooperation_agreements_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839c1087-9438-4e45-ac2a-e45e443be5d5/8880269585.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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5216 bytes
SHA-256: 9219d5aa5fe667dc6b9517acf0dcb287484c29cdeb8e7acaa690e5e1352ae67e
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 11028 bytes
SHA-256: 92d2596d454514f5457919ed69fc36d998ec84e8e604b00f127dd8a9fbd42fa3

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