Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24e6f6e4d6515c4…

MALICIOUS

PDF

97.0 KB Created: 2021-01-04 01:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5b53989809f628c4df21e6bd25978126 SHA-1: a6ade558b4fffb3cf96bc5080a3b825a64d8e1ae SHA-256: c24e6f6e4d6515c4b0c2ad70ca4ac1abacc34bdbe22bde793e69de055818f14c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of external links, many of which are likely part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to exploit PDF vulnerabilities or trick users into navigating to harmful content.

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://trafffe.ru/aws?utm_term=android+adb+apk+uninstall PDF link annotation
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/zanibaxax_rotiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fdacc95adf73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f9c138596826.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/kojiwatezug_burim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5faf82a2d8a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f89fb75ae81d.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://s3.amazonaws.com/rafiralexezol/chelsea_formation_against_liverpool_super_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/wuzixiwujafidovuboj.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/17640754463.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/81585662684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889adb8f-289f-412b-aedb-cba82fde22af/pijugedazufuxolebapimur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c751f486-fff6-44c1-b4dc-9172ab972a92/85746348272.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/carrom_disc_pool_jio_phone.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_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 4912 bytes
SHA-256: cbc3c1d5776b2a012da0d91b55a6997d1dbeb24bdd9637c5c2c405b2e8afc78b
font_01_sfnt_off00014071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14071 11824 bytes
SHA-256: ee13119f4e824660ab8a186715378909825980c345021d6f6f710599c211ee7c
font_02_sfnt_off000168cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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