Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf7dc86aec2a72c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 15:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32bda331fe2e99a79fc1159fc7941a1c SHA-1: 50801de27adb33c9e0b26e72d23bc68aa34f95c6 SHA-256: aaf7dc86aec2a72c6b1f422422b2510e0826e2a4ce621af384346646147dfad4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one heuristic indicating it's part of a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://minlinart.com/archive/upload/files/zapolasajamovemari.pdf In PDF document text
    • http://phrabat.net/UserFiles/File/12718266795.pdfIn PDF document text
    • https://sainaudit.mn/File/kafuruv.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/68914402578.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nowipesozisevetupubaj.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/lidenif.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/39382003240.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139102184282---xobizabel.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/muluwen.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wobafowovidedoweluf.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/kusabofomelegukajudab.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/pogosuf.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4aa26951---kidawoxojebu.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/68503294671.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/32196041099.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/xejimofananakaxajef.pdfIn PDF document text
    • https://kawanmto.net/contents/files/wamodo.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/88277326857.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/wezikisojuxadisowewilof.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/vigiwi.pdfIn PDF document text
    • http://telecycling.info/files/file/zijivosuwise.pdfIn PDF document text
    • https://x-software.cz/data/file/vumowuwado.pdfIn PDF document text
    • http://rurisnet.org/images/file/bitusajasalapupenono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+set+notifications+on+androidPDF 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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 10500 bytes
SHA-256: 5546281fe54e720602c2188748fd1def2917e5812c5dfb6bf328a6db14d2df97
font_02_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 15228 bytes
SHA-256: cb4a53a1107ecde032474ff02715879de2977c49bf07c7bb8e626283bd4cde9a

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