Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a7109e0869db0c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 01:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afd4f1b6b7c7060e6635f3976efea691 SHA-1: fc8734816127a7105bc06fd3188ed0005efcbc75 SHA-256: 39a7109e0869db0c3ab17d27c1dcb25fd5216ad6a436d11b07e558265e1a5db8
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a link farm with numerous disposable hosts and UTM parameters in one URL suggests an attempt to disguise malicious links. The heuristic 'SE_DOWNLOAD_BUTTON' further indicates a deceptive call-to-action, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://labonscafe.com/userfiles/sutusuwubijojikopojujopo.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/52198207418.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/95166622673.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fotimiro.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/poviwipimumerawabazewuv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5309105d---25305660063.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/80787891657.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/64678330393.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/mazogirupebujot.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/82332852342.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/87502132319.pdfIn PDF document text
    • http://keyday.ru/files/files/32543685993.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/35797273377.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zagefaguwivezeje.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/92286639566.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cek8gd7rho0bla2ik7jo032d38/77522941971.pdfIn PDF document text
    • https://theurbanthinktank.com/files/losumuxu.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wefizusuwiwulozuzepevavur.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/4078535207.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/wapesere.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/zaxavirivikuxoxixusewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pes+2015+psp+iso+file+downloadPDF 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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10808 bytes
SHA-256: 53e50927442fa78fa015b26091a63847f0b0f66ddac2d176fbfa1e6ad2d9acef
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 22472 bytes
SHA-256: 29a6f00fd4ba8a0cadde4dcea6117754734b3f6109c14524bb48cedf9e6d6d88