Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e69cc796384962…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 12:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35bc707f381571b3ef1aafa87dcabac6 SHA-1: 89ee5cd01c00a1502c7620c39524b21d4980e502 SHA-256: 88e69cc7963849627425493e4dda1f8de55a84fde7998d8fdab56f714b88b365
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, suggesting a distribution or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aspirans.com/files/file/pujaxowib.pdf In PDF document text
    • http://tce.vn/imagesflashupload/file/sofebine.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dosofefejodo.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/93585982339.pdfIn PDF document text
    • https://0900107678.com/upload/file/92120210037.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jewedarumuwabo.pdfIn PDF document text
    • http://stattus.com/assets/file/58265378069.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/birobebomikoko.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905205349.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144506348ab5---63098908091.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/48664227523.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/88762715887.pdfIn PDF document text
    • https://kokomanis.com/contents/files/83433134475.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/5826693182.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/lisawekiwedinunowosolewo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/rumoviguzaru.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/73199075766.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091410045073499.pdfIn PDF document text
    • http://contextuae.com/resimler/files/75568798546.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/dixovo.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/93030124992.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xabubapigulijo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/13877404168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+iphone+games+no+adsPDF link annotation
    • 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://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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 18648 bytes
SHA-256: 42eb170e7b6e5d1dac0cfadcfe014312d0b4c3d79e6f1b45cef7fe3765571bbe
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 10744 bytes
SHA-256: 157a5d2ffcc696c572a0eaa5d44ed92d706ada1f9a759c54d75ad463e8663fb3

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