Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3187107cea7e3…

MALICIOUS

PDF

76.2 KB Created: 2021-04-07 07:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bed97f9d70a90c3b38bf5897a00b6da3 SHA-1: 000f80a2615aa17595d02d7a5b1cd4998a976979 SHA-256: 3aa3187107cea7e3fe54ca544353cd142c6fe55d6b9eac7bb193161cdb0294d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an external URI pointing to 'gimoguvi.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the PDF's primary function is to redirect the user to a malicious site.

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://gimoguvi.ru/wix?keyword=tribal+wars+guide+reddit PDF link annotation
    • http://hisgohar.site/ocean_survival_game_mod_apk_download40vii.pdfIn PDF document text
    • http://cpskras.website/cerberus_antifurto_pro_apkiqt32.pdfIn PDF document text
    • http://expressvpn.store/fobisagovesaroresozakox8owp5.pdfIn PDF document text
    • http://mybiol.site/maslow27s_hierarchy_of_needs_bookpfglw.pdfIn PDF document text
    • http://idealicagocce.site/91564173766ahwo8.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/jeromisixinolib/pobirupubad.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/42496526033.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/wemetagi.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/harry_potter_and_the_goblet_of_fire_full_version_game_download_for_pc.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_f828481f50574edb831a390199ab612e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/towojilikejaroni.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_2a15816bbe8f4ddf94adb465f534b1c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae25150-2329-42e9-a764-703ee89fb542/are_wii_games_still_available.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_bd10e333434a4a5abba07314b5e11d24.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_5eacc6484c20460a93bbfdf6bdfb42a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/how_to_make_a_lose_weight_oatmeal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca93dc9-c0e0-4767-9e21-911430384e73/aircraft_maintenance_school_philippines.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_29cee861570e492cbc7b85f402c4751c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34049249-97ff-4d3d-b930-aa95e8c26a7e/vofafedipika.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5176 bytes
SHA-256: 36cd05b1ef77c00f703e20a1a197bf4f871bd3feeaa471c23b6db1574ae5bd52
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10888 bytes
SHA-256: 308ea3682234fdea1c46f3c541c4bb1e13ff43b108c0a5e53ebb923450e78106

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