Malicious PDF — malware analysis report

Static analysis result for SHA-256 940874c4278248ae…

MALICIOUS

PDF

92.0 KB Created: 2021-03-02 23:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9cd13c1da909b019544c1bd524d8a67f SHA-1: e84512eb93dc465e39f00a2350eeb22383c6e6be SHA-256: 940874c4278248aeb061d7ca7cc42f53acf1d9c52e3605e3ddf5f75ef9ad1c63
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 https://baarspo.ru/123?utm_term=dyson+dc25+manual PDF link annotation
    • https://cdn.sqhk.co/dodamewope/7jhifww/cannon_breech_shotgun_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/ijjbhQe/30346908322.pdfIn PDF document text
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/zaxoroluk.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gghTgi1/50758856258.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/a0Qgchj/anycall_mobile_price_list.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/5a8b559.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/d7256dd5b76df1f.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/how_to_clean_gaggia_classic_espresso_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/bogijifaviba/lWlhb7z/kilodururuvole.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/a_dolls_house_part_2_script.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/7hbbjdC/soccer_mobile_league_16_download.pdfIn PDF document text
    • https://cdn.sqhk.co/niduzabunu/dSxUyeT/fased.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/hgjhijH/city_car_driving_simulator_3_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tevefetilojas.atwebpages.com/xebedimiteberudenuf.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/sjcam_sj4000_wifi_firmware_v1.8.2.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/luther_95_theses_date.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/what_is_the_best_way_to_reheat_already_cooked_pasta.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/kanuwawupiwisos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 4980 bytes
SHA-256: d988d402b237bd82fe43fb22ac6a28b695b81e6f78b8dbb624e269d98cf832f1
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 11584 bytes
SHA-256: 6fb2e85d8021176cb66d4b2dcee73cc9d9b01e7047c03987b5c42849442439c0
font_02_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 17988 bytes
SHA-256: cfddf5691691b7d2918a7ab2fe5fa4e969895fd7ad80796a854600c3ea79af48
font_03_sfnt_off0001546d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378