Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b486abacfef45…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 08:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a77ab8d4214ec3afe1cafeee6318ca12 SHA-1: 9c46b363883913d86d3cf541fa9cf1a8f23a3bb8 SHA-256: 8c4b486abacfef45bc4300773ebfe79becd014a89005292368a3f5db77dffa12
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://crophysi.ru/123?utm_term=bunny+run+game++for+pc PDF link annotation
    • http://milesnires.xyz/nubutepevonax6p4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_60311b2f51051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_5fdb04d88c2c6.pdfIn PDF document text
    • http://wbigs.space/girisuloogpfy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fecfaf45e3bf.pdfIn PDF document text
    • http://levantemosaic.com/2012_uniform_plumbing_code_illustrated_training_manual_with_tabsrus02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5ff968f3bc311.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/nitatotol/kenmore_elite_dishwasher_clean_light_blinking_6_times.pdfIn PDF document text
    • http://pumokijovepipo.epizy.com/android_one_phones_compared.pdfIn PDF document text
    • http://kelawezup.rf.gd/how_to_configure_netgear_prosafe_gs110tp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d5aa74-800b-4dc4-9665-a74494a22e87/army_pistol_qualification_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80de6650-8149-4565-adb0-516a9a7e292a/57714312196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc1702-c39a-4a9b-a205-9de05510d0e8/77933179361.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/lugaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddbff27-6caa-4bff-bf3e-15b72f7e800b/how_to_wear_ergobaby_360_cool_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c165af28-5ae7-4dd2-9dc8-6b692d1f4a66/indesign_cookbook_template_free_download.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/93490284465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e26f3e7-30c6-470d-8baa-3506cdc165c4/how_much_is_mark_worth_on_shark_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438e9fcc-a78b-4d7d-852b-f4d532fb2b22/51467471063.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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 5276 bytes
SHA-256: b3080b6c62cb27e4b637329eb85865d436a598947dab27457d9c76d6ef408866
font_01_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 11016 bytes
SHA-256: 8598dc1f296f2b03cdbdc743d2c6c98b527b57f49fb9e324348785e22a61e98a

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