Malicious PDF — malware analysis report

Static analysis result for SHA-256 49db1d96a36238e8…

MALICIOUS

PDF

64.1 KB Created: 2021-02-06 13:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0fa46781f7ead50b99bd1f602d253b62 SHA-1: e5468739df6afea29aae32b975bbfb4f7ca9e7c6 SHA-256: 49db1d96a36238e8ad12146dadaf6d22dc0de1d75b4d4e6943227f053ec60e5f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://maypoin.ru/123?utm_term=kalaheo+high+school+calendar+2020, is embedded within the document, likely serving as the primary lure.

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://maypoin.ru/123?utm_term=kalaheo+high+school+calendar+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5ff68570e7567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_6010a3c07b5f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff28f0b3fc8c.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/9711520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fc7d5c234a89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5feddb2ee2684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384484/normal_6006309d271a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fddbdc242ca0.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/6201008.pdfIn PDF document text
    • https://bivibubumi.weebly.com/uploads/1/3/1/6/131637176/7384968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5ff1943144d09.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/kofixezazisokumona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_60060f5973fe9.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/wejusezazawukibefun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_6000bb863eeb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366661/normal_5fde616179900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5fe2e673a4f1f.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/kelageketisefuv/11474326613.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/xuruxorinejuripuxen.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/vehicle_information_application.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/2262565288.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_off0000be39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 5444 bytes
SHA-256: 62438ac67ba5e6e18152a6fb645fd5d32ae5cc654dec5c16e7bf23f0ef2aecb6
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10140 bytes
SHA-256: f1ef8dc6bd8a417a57fb814ce65094927e0badae834c95b2fc30c7020857847c

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