Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d12b4f2aa5028…

MALICIOUS

PDF

66.2 KB Created: 2021-02-17 16:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f5a202725bddbf88df31872f742b135 SHA-1: 21751555b27c7abaf6491a9a94bbb661d2bafd1b SHA-256: 7c5d12b4f2aa50285e7ec9a7e0729aac6f77cac11380e36d17bc95675fbebf36
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Graco magnum x7 pump repair kit'. The primary malicious activity observed is the presence of a large PDF link farm, with 30 external links pointing to various PDF files hosted on multiple disposable domains. This technique is commonly used to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=graco+magnum+x7+pump+repair+kit PDF link annotation
    • http://rezonansmusic.com/gejofusujkowd0.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/dieQghC/bbq_chicken_pizza_gorgonzola.pdfIn PDF document text
    • http://rasprodavaika.ru/apache_maven_free_for_windows7xr4v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_6005d9b99f144.pdfIn PDF document text
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/074862ffd.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/ihjiSwN/remington_beard_trimmer_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5fddb8f6e7696.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/383990014.pdfIn PDF document text
    • http://indital.space/ralapufis4teyq.pdfIn PDF document text
    • http://idealslim-ordina.site/52237866718eei68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600e774d21b85.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/hjigjeQ/72583131005.pdfIn PDF document text
    • http://tehnotop.site/meaning_of_amaze_in_english_languagewzho2.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ZoHhiHY/91932718859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_600bb72b9c271.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/idgesgd/69948138264.pdfIn PDF document text
    • http://mestorating.ru/my_hero_academia_episode_8_google_doo2hcq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 5284 bytes
SHA-256: fd1d95418586b013e501bacf5f24ba3694769778cb96be92104ff1ac849033e3
font_01_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 10944 bytes
SHA-256: 4a4277482bf1c03644c6741b581e33a1f56c8fc55777da5e72617bd149570f7b

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