Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40983a5c93a4c45…

MALICIOUS

PDF

66.0 KB Created: 2020-12-10 10:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 088f398670fa6b9d86bb86bde6d0f206 SHA-1: 7bfb7f954d5753c69298d7e81c047c0c80a61d31 SHA-256: f40983a5c93a4c45be1c9ec8344fd0a502b777a081b9ac7413cc4106831fc46e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' and a ClamAV detection for 'Pdf.Phishing.Trojan'. The primary malicious URL identified is trafftec.ru, which is likely used to host phishing content or distribute further malware. The document body, though heavily garbled, suggests a lure related to 'Augusto Cury gestão da emoção pdf', indicating a potential phishing pretext.

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://trafftec.ru/aws?utm_term=augusto+cury+gest%25C3%25A3o+da+emo%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fc42e6ece0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f96d41dc2b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fada8816ba5c.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/903057.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/9668666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fa843eac7eb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc16072e9fc3622d52570ce/t/5fd07e380c0c9b10ab09abd0/1607499321637/79020514330.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce7f599c282a530799846c/t/5fd09db0a040431536c2907d/1607507377073/8781366238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514788ef7301f8b2bec82/t/5fcc310f0ab5d62febe3d0ce/1607217423508/46868582569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08770802-423c-46c2-a480-4bbe135341e8/community_christian_academy_fl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc3edea61e25426e1b14039/1606675947999/planos_de_casas_de_campo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a46530c-dda8-49bb-8c82-2045dfc7e8ed/sujebakevoligatop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a81ee5c7695ca9a6fa19/t/5fc3aee72dd96f59185e6aaa/1606659816413/briggs_and_stratton_oil_filter_492932_cross_reference_chart.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 5760 bytes
SHA-256: 42f245f409f7ef37555d28e4d783f93b359ba21ae6ed0446b996b859c0dba9ab
font_01_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 13444 bytes
SHA-256: d42d7028f436daa57ee22a967b29330e9b06ec70d5c888e189e05e761393b48a
font_02_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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