Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a68ec37f56b73f6…

MALICIOUS

PDF

66.3 KB Created: 2021-03-15 00:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d9a9885010e48079ee90ff7b4bfeaa9e SHA-1: 3573514bd92a6b1154a3a0d9343c439582aa9033 SHA-256: 8a68ec37f56b73f6e27c9ad3bb126e1e393f1ae59edefb731b7ac47dd494cf97
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://fokemale.ru/wix?keyword=lab+manual+anatomy+and+physiology+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe5aa4be010b.pdfIn PDF document text
    • http://item-get.top/d-link_dir-615_reset_button7nstu.pdfIn PDF document text
    • http://ontrade.top/free_hundreds_chart_with_missing_numberstlmak.pdfIn PDF document text
    • http://wellwork.site/university_of_south_alabama_application_formmk15o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fe3e4e98ada5.pdfIn PDF document text
    • http://fruit-citrus.space/28811135364syd87.pdfIn PDF document text
    • http://plafond.xyz/whirlpool_cabrio_washer_manual_error_codesfdvvb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_5fe873b0a53de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_600d80b063665.pdfIn PDF document text
    • http://znakomstva18x.site/why_is_my_kitchenaid_ice_maker_not_making_ice0ugia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fe84b494e222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490121/normal_5ff545a69640c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_6045f0e1dfe82.pdfIn PDF document text
    • http://letnesil.xyz/28871388820paiq1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_524e50fc63ba49c5a54030a49c2bb72e.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_36de23aaa80441278a797e6803748e9d.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_9c19fe4573384caaae942f7d6f2092a8.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_3ef6c7782b8341e3a03a61b42a4cdda0.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_a4e374cac2c84938bef5aeea8a6ad48d.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_5ff162e1aa0b417bb1e8d068d082e1b2.pdf?index=trueIn 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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 5648 bytes
SHA-256: e36746dee101e0fd0f8f80f5d51498730cb83d5557500eaca8b008c11340b88b
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 10424 bytes
SHA-256: 455ad1b7c713264934a189b1ed3797bec28b103984b22506d5d80d335d34f15a

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