Malicious PDF — malware analysis report

Static analysis result for SHA-256 275cd95ef89cde4c…

MALICIOUS

PDF

62.0 KB Created: 2020-11-13 16:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 49ca5149bda8b319787438216e782ea2 SHA-1: b2b8dce5ef7a3764c0f2f7588fac8a8114408c93 SHA-256: 275cd95ef89cde4c8345aae02ba093daf8a7bd8555bde5fce1022ed63468d3cc
184 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. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=hridaya+sakhi+song+ringtone PDF link annotation
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/jivupasir-jizaw-fefobagiru-nugef.pdfIn PDF document text
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/7717e2f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fac4267b569e.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/5005900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5f8e54cb08e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_5f99382ce22b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f942cd4f24e9.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://uploads.strikinglycdn.com/files/80b4e7e8-159d-46e7-b022-7cb3a52b389c/patonubinutizupaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31965c6-922e-4901-a446-7ed0e5aa8bbc/77250890920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edc1a7b-eeae-4c18-be89-fc63b15f33cd/xukejagavebesijepapef.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_off0000a86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA86B 4972 bytes
SHA-256: 18da9309f8633ca37c61492327af2b6ba154c911634ddcd759aaeb88d77e5122
font_01_sfnt_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 10636 bytes
SHA-256: 61ff43a5e1db0edb22d85b364b3ca54fb7a37b6434c74ad5b3b3c78572bfb033
font_02_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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