Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aef60924dd5526…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 13:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26dec6e342e792cedb68e571c34577a0 SHA-1: 914d3b4dcf0242026c9904b09ac60920643ec0db SHA-256: b2aef60924dd5526c2b2d5255a3efc801499e0bb4f280b81b9594002b9f6af6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure itself can contain JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=jim+rohn+90+days+to+financial+mastery+pdf PDF link annotation
    • http://bulk-supplies.com/userfiles/file/jufexosama.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c02f49658a---fujufuvamemujudefetodat.pdfIn PDF document text
    • https://gencatakan.com/upload/file/kisalapimevaxutesupino.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57313481615.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/57757054980.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/65881950058.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/32133860094.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dumenonem.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/nutuwud.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/tonupilifusadisatibirukin.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/bomewatodawetesodon.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/bolunufidapevak.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/62019724958.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/32944258834.pdfIn PDF document text
    • https://tebra.si/userfiles/file/82654062147.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/25454196022.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/6706813015.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/21308187274.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/44707752620.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/dapakovogisimikufebaf.pdfIn PDF document text
    • http://ux-school.ru/files/files/89005849801.pdfIn PDF document text
    • https://ijp2.com/contents/files/4003253242.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://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_off0000bbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF6 11280 bytes
SHA-256: 2da726dd9c0deac2679ceb0189dd21a31223f4e836b5b7f4f715427adb9fad60
font_01_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 17144 bytes
SHA-256: d2431c17b46159d64843ecdfe286580ec48ec0d1beb7f829a6331807ac65e8c5

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