Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a716853fa09860b…

MALICIOUS

PDF

68.8 KB Created: 2020-11-28 19:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 98233109ba2feb36dd8220e6df32b3c6 SHA-1: 70f21dcaf250cff09fdb61d686ce7b025e5b0de0 SHA-256: 9a716853fa09860b12018ca0d0f3c8843f449bbeec87fcedff0361002fb13ff6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent URL, 'https://trafficel.ru/123?utm_term=tera+etching+guide+2020', being identified as a potential lure. The presence of embedded artifacts and the overall structure suggest an attempt to disguise malicious content within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=tera+etching+guide+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fc247af6bdf3.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/fodudovifiwi_nonem_lokuzi.pdfIn PDF document text
    • https://zuvopejibi.weebly.com/uploads/1/3/4/0/134017525/joxoxegejew-besokotul-vigikepapopis-gukowevebelepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fa2dd48a1afb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6332df2c-2e5b-478e-b7d6-f4be22ed4d51/understanding_ultrasound_physics_ede.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/how_to_answer_teamwork_behavioral_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426762ee-6ccf-4f82-be45-a5c9b10b9400/cold_steel_hand_and_a_half_sword.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/texokelesoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cede9f5-e798-4b39-9b5a-c58660cb3475/batman_arkham_knight_guide_downl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5dae46-3804-468d-b0b9-26f031d7a378/dn_dernek_tek_link_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd065320-cf0f-42e9-b10b-6cbc27afdfb3/44676669668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db6b1a2-11e4-4839-8db5-0f84db938c54/stash_changes_git_visual_studio_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b52283c-f152-4b5d-83e1-3c1d9a6ddf4e/mutant_chronicles_rpg_download.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/18082185954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06429213-0992-47f7-a09b-25fe8495c53b/71970593272.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/tenancy_agreement_form_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cb4f26-71d6-4cea-9d10-4cf80d4df178/happy_birthday_brittany_funny_meme.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 5216 bytes
SHA-256: 102576a9992a4cf599c3d66cea4beb4490ef94ff1373436544efd9722e89edbb
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 11128 bytes
SHA-256: 7f529cae9c9886e7cc7bc4701ade1dea509bbbcc454efc232687bd82876fa093

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