Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bd7c04d7344f43…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 10:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70e430d278dddee68c5183846c00f292 SHA-1: 436ee3fad5acd507066f4cfd063f07bd8a05acbd SHA-256: a6bd7c04d7344f432258939e1174a10d8696d77f3ef600c8a50fc0572681f395
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure suggest an attempt to lure users into clicking malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=standard+deviation+normal PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161425f014f24f---3538967509.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/gavadipofagirirade.pdfIn PDF document text
    • http://sdes.in/uploads/44310949782.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_162119_104.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/57084546461.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909035101.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kurovevujodokegakotal.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/70710204606.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/14612520719.pdfIn PDF document text
    • http://panova-art.com/files/file/niwiviripusuwew.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/75072711765.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gopuwarogosisap.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/26546641230.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/zepaw.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/66465129666.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/35079099478.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163199267273967356305.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gabiwiletukapabovixoda.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/rijukuzobakulafi.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/xovekiketowobazibufixo.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gadowatagej.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_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 18248 bytes
SHA-256: fe874b63e29f38c03d1f9923567dcc6b81996623d0e6a5fd8a2555c7a6c422c2
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 10384 bytes
SHA-256: 9f8622cf5bf80e3935f6a5f51273c6507a54adfa673941216fe8bec25dbd070c

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