Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d7b1d33150c78…

MALICIOUS

PDF

74.4 KB Created: 2021-01-06 14:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a47db5d3e84adb99f3211db7ce7d1458 SHA-1: 085280a991233b3e6e6779c569bd8ca8152c2b18 SHA-256: 4f9d7b1d33150c78c4943d67de3a45ace70cb6ecadd8e3d1a623ed79d8979208
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, many pointing to Weebly-hosted PDFs, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this as a phishing or trojan PDF. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=crimson+court+boss+guide PDF link annotation
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/8b23f4.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/8998409.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/bakijewebizowe_soris.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/jawififenox.pdfIn PDF document text
    • https://mufirurinonezu.weebly.com/uploads/1/3/4/6/134669904/fakoxor.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/potokoloxat.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/3a1ab98813c.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/IiiIigg/33889815697.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/69128954-83c9-4c29-b03c-3a53c4d44bd2/pretty_woman_1990_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/63585328774.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/saboburuxuzogaximudepe.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/ahci_vs_ide_ssd_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/nutijefizorikuwuzedexono.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/calendario_2020_gratis_da_stampare.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 5064 bytes
SHA-256: 4ffec6c326a8e8806717dd03b029705b56de5bf3a51ac8039e3997ab84461b35
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 10628 bytes
SHA-256: baef1c547a4b1bb428e63dc306ac71a0f1d795d117b302cca56748c6a26a518d

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