Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29d7d20c5b57fc7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 15:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba1aa890eeeedfac5b758a6f354b200e SHA-1: 00f190648fb6de130d2893f52b44805fac53b2c5 SHA-256: a29d7d20c5b57fc72295dafb272e1d0bcbb5db27d90186d8843b1ed48675bb17
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the overall structure point towards a spearphishing attachment, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=android+string+to+byte+array PDF link annotation
    • http://mazraeir.com/images/upload/files/24664584432.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/tevefubutizoxifex.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/2326321927.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/21055504914.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/61607408635.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210904100945.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909120900.pdfIn PDF document text
    • http://iscelenie.info/files/file/20393432166.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/noliki.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/95696229809.pdfIn PDF document text
    • https://nasikampung.info/contents/files/wovimu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/kugozogesajibodora.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091016001380554.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/97275092656.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/56490793459.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614113b2d80b4---mamutamonovamijejobi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/46329879885.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/movakavofutefewa.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/savadiwabipabozisobirus.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/49598862802.pdfIn PDF document text
    • http://indel.sk/userfiles/file/64236936777.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/13826795690.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/1405760121.pdfIn PDF document text
    • http://upakuika.com/img/file/15676633377.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://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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 16752 bytes
SHA-256: ab3b745a3631ec53d446ff856c247270ebd336ed3118cea780932e53cefd7c90
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10612 bytes
SHA-256: 703584ec2fd4a68c2de3bd929609adb089c3b7865c6db3aba9208678a090fd0a
font_02_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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