Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6cca56c0f25c4e…

MALICIOUS

PDF

80.2 KB Created: 2021-06-09 09:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be1bb5bba6509ca93672eaffdfee3b4f SHA-1: f4278e14b76a4577d1d3c0deef9fd139408f89ee SHA-256: 9d6cca56c0f25c4ed1fa70c227d79956a0dbd6ce4e8b2848df68b251509bd6c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://pistant.ru/pbw?utm_term=tujhe+kitna+chahne+lage+song+lyrics+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368750/normal_6037cb602eb1d.pdfIn PDF document text
    • https://ledoxobi.weebly.com/uploads/1/3/4/7/134703017/8457551.pdfIn PDF document text
    • https://regujovirex.weebly.com/uploads/1/3/7/5/137508242/8874997.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/858728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_60599c308fbf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5fe2264925aed.pdfIn PDF document text
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/mabuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_604de0cb2bb0c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4471096/normal_60afef1f80e1c.pdfIn PDF document text
    • https://nigizamizu.weebly.com/uploads/1/3/4/3/134319440/dusijexalek-ziteg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144593730/buwakawizaxex.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144573495/pijisimis.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/a_christmas_element_word_search_answers.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/79224683779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fca7ac-46c4-487c-a0d2-46174f014746/3625991387.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/ncert_class_10_english_literature_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625ec020-1d17-44b1-9130-bbe3b2f07d83/14801137422.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 5252 bytes
SHA-256: 3f25d8619755067eed070209296a9d255a7d5f2bb0e6c6bbb7b2fde76e60117f
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10728 bytes
SHA-256: 769f63ae1379e7dded16059a9979399983355e2a11f9819bce58cf8aa555e6c2
font_02_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 9376 bytes
SHA-256: 511f9c96b5869a8193742d6e775ea726da398b2f342df8271e176f64183e2622

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