Malicious PDF — malware analysis report

Static analysis result for SHA-256 c171a485e47875f9…

MALICIOUS

PDF

75.8 KB Created: 2021-01-31 10:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4b0c6eb29ea12348b93d51e99b31d3c7 SHA-1: e9afd3721cd8db783a40b80eead6b49c37583818 SHA-256: c171a485e47875f90b818589f7020c01f8ed8911216cfd7c19ad82cbad8a3851
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for further exploitation or credential harvesting.

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://jottigo.ru/aws?utm_term=bleaching+white+sheets+in+washing+machine PDF link annotation
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/wumipokoxu-ziwefanuz-jukup-ganozunoxupu.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/40809177844.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/tosoxoxenefo.pdfIn PDF document text
    • http://tuxosuzarug.iblogger.org/gossard_bra_size_guide.pdfIn PDF document text
    • http://fewemika.66ghz.com/stfu_im_listening_to_meme_template.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/6e3060cc131.pdfIn PDF document text
    • http://medtechnika1.ru/23697433481521bw.pdfIn PDF document text
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/sapeb.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/jolozidabi/92884407344.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/iba_10_bipartite_settlement.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/47942731458.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/choices_latest_version_apk.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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5260 bytes
SHA-256: dd8ed85a9c8a7cb12144ab87830371aefe140d83d6a11f491667285b9f5d052a
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 11256 bytes
SHA-256: dbb363cf8a9705740b3c95cf39b7928137def4b4d4c375268c7036e8b692a683

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