Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0931f7d5cbffd6a…

MALICIOUS

PDF

94.6 KB Created: 2021-05-10 06:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b2444bc58ea1d384bfe51662201b4dd SHA-1: c932f65fc20bfb9978051543998400eae41fe0fd SHA-256: d0931f7d5cbffd6aa323246f1f9213cc16c3bb60ef27b3b6eaa88d93e759b9c2
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 0.9996

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://jottigo.ru/strik?utm_term=how+to+get+treatment+for+social+anxiety+disorder+with+cbt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479454/normal_601ae13aa0f6c.pdfIn PDF document text
    • http://frontglass.xyz/you_know_my_name_sheet_musicc5i00.pdfIn PDF document text
    • http://detonic-de.website/dota_auto_chess_cheat_sheetxaqv1.pdfIn PDF document text
    • http://f1l3download.site/83760382674lxkcj.pdfIn PDF document text
    • http://topshops.website/ba_1st_year_sanskrit_bookoq9tk.pdfIn PDF document text
    • http://13millions-warzone.store/run_ronnie_run_soundtrack7rwt3.pdfIn PDF document text
    • http://ihsteam.ru/does_whirlpool_dishwasher_have_a_filterrghss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5fdd6580071a2.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/HnDjbih/sejemivevotesolex.pdfIn PDF document text
    • http://lyudi23.ru/tikitazezasurapugize3hp33.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/2XODcCD/custom_maps_minecraft_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/ccDfgjK/xexesipobolubiluvodo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/ahgwKha/73962167065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gomakobez/hec_ras_tutorial_step_by_step.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_f646aa5c3f49451fa47e418705c60213.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/474811623.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_1875dc0e05e741c6aac1e4c5bdca4a3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/wovomepame.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_d7bed530d11e4464b2b522ce63344d84.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 5588 bytes
SHA-256: 6d6843c6ff7eb313ad2654041a5009fa5ba9a49854989435aec8437d06c99dc4
font_01_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 11032 bytes
SHA-256: d5c13a9a35ff1c67fc30f2decbc8c1c5cd80666045d78b873a9d62283fbc3530
font_02_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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