Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d2f58518b367c6…

MALICIOUS

PDF

88.6 KB Created: 2021-04-05 13:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ace9476a04e7c10e842687a42fed65d SHA-1: 93ad9df3bee5de326ec11959f91111640fd8e35d SHA-256: f1d2f58518b367c648443a944d8f85170a066b0541063cb75d2a99908318bb3f
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 0.9988

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://golowaki.ru/strik?utm_term=the+wife%2527s+lament+analysis+pdf PDF link annotation
    • https://cdn.sqhk.co/baxotonad/Qjhijhi/most_popular_tiktok_songs_june_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_603dc9e68838c.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/gqqz9ij/pink_pencil_case_kmart.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/8982206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5ff3c3d007175.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/logazuvifok-lebowabejevupo.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/gOGPtpz/dejadabeluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_603ce60324013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5feb7b3f9921c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_600c1413480ac.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/poibgee/penutigowemutivesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_604f5c2d35f16.pdfIn PDF document text
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/590b96ee7081.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/gegatupijojojuril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5fda556ee3f27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_4bd46bd7193545c1b2afc35e3a374a63.pdf?index=trueIn PDF document text
    • http://puwagof.rf.gd/broiler_farming_project_report_1000_birds.pdfIn PDF document text
    • http://vosegigusuxiku.rf.gd/25689129539.pdfIn PDF document text
    • http://dalatizofudow.rf.gd/ibps_computer_awareness_book.pdfIn PDF document text
    • http://risitikavaj.rf.gd/what_is_the_difference_between_pool_and_snooker.pdfIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_81c1549ede6a4e9fbbb3d0a69e991f11.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_81e35dc3c47f4bff8a1a7c08c5de69a6.pdf?index=trueIn PDF document text
    • http://tovilan.rf.gd/63638980783.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_e83534e0305f48a1a084a0d653ade0f1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 5360 bytes
SHA-256: 3202e884d66079632121b4daf19963de660dd1b6b765c4405abf09021798cead
font_01_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 11104 bytes
SHA-256: 9045e6089860961556575741ae5bdbbb4da60a387596d93611abe44cc428e243
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15