Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c97e2f9afca63c…

MALICIOUS

PDF

64.7 KB Created: 2020-11-23 04:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8f30473e9e0605de9ecd13676fcbbc34 SHA-1: 2bba1d04ff25593673cf64f4a1e3bba9178ebb62 SHA-256: 77c97e2f9afca63cede1295f4d0501790a389f553be6e0bccd9bebf9b0db8207
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious sites. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs, such as 'https://trafffe.ru/aws?utm_term=laredo+tx+crime+report', are likely part of the malicious infrastructure.

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://trafffe.ru/aws?utm_term=laredo+tx+crime+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fae7cfb5cea6.pdfIn PDF document text
    • https://kodepukezaxa.weebly.com/uploads/1/3/4/6/134665187/7180450.pdfIn PDF document text
    • https://damafofazawarag.weebly.com/uploads/1/3/4/3/134369947/dikoxepasalav.pdfIn PDF document text
    • https://mofivekirupu.weebly.com/uploads/1/3/2/7/132740685/7420203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476148/normal_5fb8b193f1fde.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/fekaduvopigab/81082055790.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/aerosoft_a320_p3d_v4_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc62dcb0-339d-4201-b7ff-a61583c7d67c/chemistry_a_molecular_approach_4th_edition_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/biodata_form_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/probability_and_statistics_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/79970602548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edda02b-df5a-4f88-b8af-fe73131b77a2/pumuzevepin.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/maximus_body.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/83588834937.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_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 5016 bytes
SHA-256: 4fae8a39aa679e95c45f6b7046f12f82d69391fb0656ce11cc6bd90c3823ca1d
font_01_sfnt_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 10196 bytes
SHA-256: 9021d76d591cea3e154122b87aedb430b57ec2dc34bfa04af02171f2ec934308

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