Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fb0ac8a988af9c…

MALICIOUS

PDF

87.5 KB Created: 2021-05-15 13:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 418bfe815ced761096e4c1f27b1713b0 SHA-1: e4c4f56b28b17f9d6ef36baac1ae970eae878a83 SHA-256: 43fb0ac8a988af9c71b6a0a9d8ac6e472cf21856879df725cb24a2d2d680bcba
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a lure for remote support tools. The document body, though heavily obfuscated, suggests a deceptive purpose. The presence of numerous embedded URLs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://crophysi.ru/strik?utm_term=design+change+the+world In PDF document text
    • https://cdn.sqhk.co/josurowelimu/iijggiF/ice_hockey_3d_mod.pdfIn PDF document text
    • http://scandisvet.ru/66005001133pwxzm.pdfIn PDF document text
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/5261704.pdfIn PDF document text
    • https://cdn.sqhk.co/talokelom/eggigVq/89539638005.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/eLEWidE/cop_sounds_and_lights.pdfIn PDF document text
    • http://help-violation.com/sisimugugoragelezet3g6cf.pdfIn PDF document text
    • http://lezapogogaz.iblogger.org/bufodudusisise.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/hcgcje8/jango_radio_app_apk.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/9ff0da8c73ca.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/1298454.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/9843095dc7be77.pdfIn PDF document text
    • http://hookup750.website/kofanenemufuvapefexopepu2mwkt.pdfIn PDF document text
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/3946627.pdfIn PDF document text
    • http://sentytld.online/asus_mx279h_price_in_pakistanv47oc.pdfIn PDF document text
    • https://jaxugitiboxon.weebly.com/uploads/1/3/5/3/135346561/lexefemel.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/giAsoji/mannequin_scary_creepy_horror_escape_room_games.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://wepesubotivirel.epizy.com/gregory_porter_real_good_hands_sheet_music.pdfIn PDF document text
    • http://tuserigetov.rf.gd/buxomeresirenewofew.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_b5a30f73c4c5426b9cf48fe7e1a56fcd.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_8e73f72e9fdd4348b1c0547fa8ed0bf3.pdf?index=trueIn PDF document text
    • http://muwalolerede.epizy.com/vekaludetusu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 5080 bytes
SHA-256: 0da08f10f549d4ca6170831fd84b89c223914404af716169656499687cb441db
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 11668 bytes
SHA-256: 5766240a4b4a81b968bcde60820093b830569559577d4913dd4325a8646e0dac
font_02_sfnt_off00014121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71