Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2599e14b418cd…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81490ba343aa14f876a5560d6d449c0a SHA-1: 11de4e9bc3a002fd310be882ca497c767707694f SHA-256: f9a2599e14b418cdec5085d5946e9ff6f14be2c1066d0239e0a3d451856c7cf8
126 Risk Score

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/strik?utm_term=primo+levi+books+if+this+is+a+man PDF link annotation
    • https://cdn.sqhk.co/bomoxale/J8fhfii/zurisutix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_600dfcb762c61.pdfIn PDF document text
    • http://wejabofilu.iblogger.org/lyrics_seven_years_norah_jones.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/tibewaguza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_6062567b17dac.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/jitemo.pdfIn PDF document text
    • http://islandlandscapesbb.com/ejercicios_de_valor_presente_netokwv3v.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/fuvido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366645/normal_5fdd8721a6ef2.pdfIn PDF document text
    • http://eslife.pro/dd_warforged_colossusipuo2.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/ficjcig/roblox_gift_card_target.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/hb0gfgi/marshawn_lynch_skittles_cleats.pdfIn PDF document text
    • https://tixoguwod.weebly.com/uploads/1/3/4/6/134694164/punorumabuworaruv.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/kikunojulejuj/15653510890.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/11748282274.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/dungeon_master_s_guide_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/2019_ford_mustang_convertible_lease.pdfIn PDF document text
    • http://jiwunix.epizy.com/61540998876.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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 5272 bytes
SHA-256: edf5973d2c9ffc7e28042080c2fc3f6fae31294378c8d0083da31df2169c687b
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 11728 bytes
SHA-256: 3a0ceca423766fcc32598d386a270b965a6d4bd7cc40f1fbf15ead47cf127efb