Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7db2f430bebe8a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 13:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4594bed08831fe3a4ad953ad03c7ebb0 SHA-1: 2f2013906f4eb6b2e655c83dd5583a565173c43c SHA-256: 8f7db2f430bebe8a288fefe96e774123dbb2449a20cb7bddcd7114470857907b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of urgency language further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=verbal+logical+reasoning+questions+and+answers+pdf PDF link annotation
    • http://ig-einheitsloks.de/medien/file/jedoxugoda.pdfIn PDF document text
    • https://aitalk.vn/upload/files/gefawododafiz.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/fixipebudumorajugewe.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/31891082466.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58474307093.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/21799302695.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/mudezonakijetu.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xabebavubekawabe.pdfIn PDF document text
    • http://lovesenergy.nl/file/kogenokiwodazi.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/jugaxejagalexek.pdfIn PDF document text
    • http://fitviewer.com/files/file/voravodotewulexaguzimusu.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/sefoxevosaj.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xetutaxamowubijobet.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/varejakugevuto.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/fejonakobegaviwofaba.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/28039176745.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/58234353179.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/78484768545.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/44213260383.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/koderirupexone.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/gejirokonodelijemifubir.pdfIn PDF document text
    • http://jadeite.ru/images/file/mamemomisesanetujavifumu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367ef97847d---28344065827.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_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 18056 bytes
SHA-256: e5054c7c793d1dcf4c07ad4065e981de95d69ddd80c371d443382d1dfe93ffe8
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 11236 bytes
SHA-256: 93194875834af4bf0905b2f9733b425ea5003d85e7f32de07ccb833ad687f6ae

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