Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5f6120369ab5b1…

MALICIOUS

PDF

77.5 KB Created: 2021-04-23 17:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68b8d2bd7b02911f41607e6cfd63fc4d SHA-1: 3bb7348575fb8f98f0200843bc28f31112373ec5 SHA-256: 2f5f6120369ab5b1579b145412ea13dc7ef5de4493aab230bdbde484273624cc
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=what+are+the+elements+of+graphic+design PDF link annotation
    • http://xuzerujagojagip.scienceontheweb.net/easy_christmas_songs_piano_sheet_music_free.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/15003419708.pdfIn PDF document text
    • http://republvinb.fun/61591146599a90ub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ff1e4696b2f7.pdfIn PDF document text
    • http://reliables.ru/85684832347mmhk1.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/ifjeY85/5893404394.pdfIn PDF document text
    • http://216tilford.com/argumentative_essay_outline_example3tu5x.pdfIn PDF document text
    • http://ergors.space/paediatric_anesthesiahnkor.pdfIn PDF document text
    • http://prostotit.site/yorke_peninsula_fishing_reportbbkt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c7dbcf223a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_6031cb697d969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60135f2cac935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5ffe171e58654.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/vZnmkhg/dirt_bike_unchained_mod_apk_1._6._6.pdfIn PDF document text
    • http://tlgfree.xyz/ipl_match_list_2020_downloadd6a5q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cf8818-2ce4-4fa7-9ee9-4a7df4ff4a44/beginning_signs_of_rheumatoid_arthritis_in_hands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e93b7ce-0b01-4b3a-8849-4a329f5c5be5/gotavasudinawufevab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda74bf6-954c-4370-a783-a2b9be5de97d/85945673164.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_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5580 bytes
SHA-256: f3e9e21b1ee41be7612c2a5dbbcb2edfd449a9ae7304562ebaf7442f1ba6f0e2
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10792 bytes
SHA-256: 18d7d3f551a6a8907fc626411341245fb4043aaad199dfa35e186009f1a3ff28

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