Malicious PDF — malware analysis report

Static analysis result for SHA-256 50987c1bf6513ed5…

MALICIOUS

PDF

72.9 KB Created: 2021-02-21 12:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b6ad3c55a9aafb9a2c9365048e9de2e SHA-1: 9b041f725bc11214863ff915bdc28458a556d7a9 SHA-256: 50987c1bf6513ed5aa885e5f5e2e6b5bf27f645192db5dde6ca21b08d1bacc41
186 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=hoa+mai+tet+dep PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5ff2293120e89.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/zesizavubenala_memafubal_sopogu_xifud.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/jipuruw-nenopenofom-mafadulujizix-ribakogepif.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/vanomov.pdfIn PDF document text
    • https://zexamedoguko.weebly.com/uploads/1/3/1/4/131454027/zivorivoj-voxaluten-sesira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_600d92c1d17f3.pdfIn PDF document text
    • https://xanalefude.weebly.com/uploads/1/3/1/4/131411596/jodixujusamumozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffc2b0e10e9c.pdfIn PDF document text
    • http://cleaner360.shop/kozogiroz465c8.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/582151.pdfIn PDF document text
    • https://rakurewirusemew.weebly.com/uploads/1/3/4/0/134017151/7b4d382555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484370/normal_6001fb7823345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_6017a6a66fe00.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/gizajoxatoninis_rixademe_dotarineziwelu.pdfIn PDF document text
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/1bda50301b.pdfIn PDF document text
    • http://helpverifedbadges.com/competitors_profile_templateha2xh.pdfIn PDF document text
    • http://finansi-7.online/comparing_and_ordering_real_numbers_worksheet_answersfbotz.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/ginutu/97335756362.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wejezanizusukirebufenera.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/jovof.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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 4760 bytes
SHA-256: 5214c09591fcb5a813259ab092b7c045e798ee4584552b6bd842005fe19cb3a3
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 10248 bytes
SHA-256: 274678b97fd0831985b3bc71c1f8582d02ead198ff3e6b45f2ec3494b86bb0ea

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