Malicious PDF — malware analysis report

Static analysis result for SHA-256 31db3bac307627cd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 04:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2695768aa71c03fba010e7afdb24f46 SHA-1: a4cf2cf8d64e07d59ba352edd27ce9af1cfd0e5b SHA-256: 31db3bac307627cd00df318e876b7cf53acce219c38738f6a8d4cf610ad6525d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, with numerous distinct hosts and links, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://christ-china.com/filespath/files/20210906135122.pdf In PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/87046120514.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/84339990414.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/44530134176.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/29347072657.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lureloredigobulekujo.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/dodizakimofapuzibaw.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64470454840.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/joxaropobalevozekibita.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/tirikatifuzovev.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89301511535.pdfIn PDF document text
    • https://superchills.com/userfiles/file/zetavaruwunabofuv.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/velufaveba.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f39f40839245e31558555f47a0cadfe4/nuvaziditologapigasevaga.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/33936395140.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xavobagopobubera.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/mogipiwidilafegomojol.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/24133580884.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/84169851710.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/deramagevitamegugazan.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/69054568954.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pefatitosot.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/rejaxojuvapipigutemaxo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/worinisekakanafitif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+seru+di+iphonePDF 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 17764 bytes
SHA-256: 62f61f26f9c1aa247b53941f248610a362b2820db4f7f5169513fa1a35fd0702
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 10652 bytes
SHA-256: 5e03ff517c47bd56cc2263340b0efc88d8f15c8994ef00f29444f04b2c3418d7

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