Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a22dbd81531388c…

MALICIOUS

PDF

84.1 KB Created: 2021-10-08 21:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41af824b7b782f725ba268a9476b9049 SHA-1: 288c980ece543315f01cef500e087330038032b4 SHA-256: 2a22dbd81531388c2b99415f4caa2a5021bdcb61e1fe73a68027528866426a9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://palmdale.thepokeluau.com/uploads/files/54463842538.pdf In PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210901_6AC06B3C2C693590.pdfIn PDF document text
    • http://podushka.by/files/files/zidomiwu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2b997e23---84138972142.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/gutemotudupola.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/majiwudaperojenig.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021092911012270554.pdfIn PDF document text
    • http://taigesw.com/upload/files/24072531274.pdfIn PDF document text
    • https://clinicscrm.com/img/files/wojodoxir.pdfIn PDF document text
    • http://bluebossa.pl/files/file/62484374499.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/zexab.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/vovuzawavajusavebufe.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/78082424545.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/84935351788.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/178488437.pdfIn PDF document text
    • http://klaaswester.nl/img/file/95436899091.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/ganabopokidudonika.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/73589920214.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/32272789559.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202110050029074318.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/rulozusofasozatum.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/896cc0c67d664396ba14ba67b3396602/jitaleruzixunozirobuked.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/66264920117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=as+a+piece+of+cakePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 20480 bytes
SHA-256: 3067fc852c04dc08010f6a9cba16264a23b27167f39ad5fca1038572f0ec3a32
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_02_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 10200 bytes
SHA-256: d7bcad018d1d4d44a3198976ff47605996431cb53d2aa0bf06a87337f9c3919e
font_03_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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