Malicious PDF — malware analysis report

Static analysis result for SHA-256 92623626669a6c5a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 03:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a9b7dae95373178c14ba61ad78334e9 SHA-1: 01326bcaa93df8ac3c11bc8e8147e74707a41e7d SHA-256: 92623626669a6c5af0a3e40c1e36bf396ecada432fea771b2137b867de123573
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One high-severity heuristic specifically flagged a PDF link to an algorithmically-generated URL, suggesting a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://betenrealestate.com/sites/default/files/file/83212046943.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bd61b3438bb8c14b62c3cd9ae60681e9/60150133815.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/96387113779.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/98561716303.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/dadop.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/jujokekekavajuxomewo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/14034965357.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313477128686.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/71946163631.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/46857481054.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/73822377972.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/nurovimazajosibugitale.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/levarogubapupuvamezim.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/golirezevuzexodem.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdab370b5c---91652462995.pdfIn PDF document text
    • https://fasleh.net/Files/files/jigikabopuwo.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/ranatexexadilovuwof.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/lowufa.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fivadikiwusafoba.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/gidodobugep.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/48176665679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+tv+miracast+appPDF 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 17932 bytes
SHA-256: d8cd84395008c97c2a6666f62d0de1277a3b8fc0fc349daededd8d4a0cb41920
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 10544 bytes
SHA-256: a05ebdd2a454bedfcc07b889cfd472b6ac3cd7eeaf9ce2e9de1147158be4b04f