Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bf0b790e3721e6…

MALICIOUS

PDF

87.7 KB Created: 2021-03-01 00:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9eeb605f628a21bb4ea95a9cf0bdf445 SHA-1: e73b833a81d6be540e3063d13999ce44487a22ca SHA-256: 03bf0b790e3721e6645518b641e396fdd0a01b4c6cf6569082aa046fb1ec4d2c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the heuristic firings, including ClamAV detection and ML classification, strongly indicate malicious intent. The document body, though obfuscated, contains keywords related to search queries, reinforcing the lure. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/wix?keyword=orthopedics+made+ridiculously+simple+pdf+download PDF link annotation
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/9428593.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/ihfheGF/tupulevuzolatilekesuxuku.pdfIn PDF document text
    • http://wutugupim.iblogger.org/animated_screensavers_for_desktop_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gidurekigov/ggjejaR/bowling_idle_mod_apk_happymod.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/5288445.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/hjSibhd/bit_dungeon_2_apk_free_download.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/nutotalo_tanub_soxukuj_mumav.pdfIn PDF document text
    • http://zitokik.iblogger.org/fesuwasikidesiwukad.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Zjh9hhh/2047665409.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/helIPgc/axis_football_2015_y8.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/92466adf5.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/mojixagawezisav.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/VDpgifi/vewakubodisamexawozetavi.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/hdbigwK/big_bang_evolution_hile_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dujepav/avast_antivirus_full_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • http://femejuzi.epizy.com/73900740888.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/676706992.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/sports_tv_ios_app.pdfIn PDF document text
    • http://xixujoteb.epizy.com/fnma_ltv_guidelines_for_investment_property.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 5616 bytes
SHA-256: 7cb3cf97f0233ee8f486a46ed562f8169ae29bf39af682d4be33ba91996dfc48
font_01_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 11192 bytes
SHA-256: 043b0c9364e0fafc20d5d16c7f8034ce1728e5f65f2d98e2421e66337d540cc8

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