Malicious PDF — malware analysis report

Static analysis result for SHA-256 784e5bca53884ff7…

MALICIOUS

PDF

78.5 KB Created: 2021-01-03 12:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78fa90410cfc1d03bfaa7f91c83bce29 SHA-1: 975806027be82017c70bba5394c629e261753a83 SHA-256: 784e5bca53884ff7d02ed948c56586ccc75baafe0bc1857d953700a6adc9c1ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/aws?utm_term=wow+classic+warlock+leveling+guide+icy+veins PDF link annotation
    • https://malozesa.weebly.com/uploads/1/3/4/5/134505473/mudogitatirad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fad4159a540d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd30f173a9d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ff00041e2ade.pdfIn PDF document text
    • https://kitujimozudek.weebly.com/uploads/1/3/4/3/134375735/pemakazamux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fc3190b0ac6c.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/ded0763f-9bf7-4239-995a-f35ca5fa0d75/44591543821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11206db2-7c59-44f9-a69b-fb33fe7fe2ee/juxutogunove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826afb1f-14ad-45d4-b73e-57f82ff69d36/webakunetibek.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/how_to_backup_photos_from_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a81a9df-02bd-4904-9869-6c5eb6f0b2b6/52172909006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52808f95-4d55-406e-9199-3896e5029a9e/fadesegerabeweduluvowafes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d50ca4f-ec7d-4b8b-bd93-169a6a40f198/gasavowuwijidapapavavet.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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 5436 bytes
SHA-256: 50e02eb08cebdba7233bcef875ebb55ce06e076c33345ce7922db90acfa0018e
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 10304 bytes
SHA-256: fab74cebb179e7c4152ecaa3fc6ac56515e3e47b3f2a5d0b2097cf96697fba31

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