Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3feb640a31ba37…

MALICIOUS

PDF

86.4 KB Created: 2021-04-03 08:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c75a6eea3f240c28e863cada750286a SHA-1: 10cc3b620da1297e710e3aa56abf12ca444b84f2 SHA-256: 0f3feb640a31ba371e26a53031725c232a8be3489bd76d72114955b73602d266
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://ponafet.ru/strik?utm_term=your+wish+is+my+command+meaning+in+hindi PDF link annotation
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/2595323.pdfIn PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/xavazonifemob_jabijeji_gedexegep.pdfIn PDF document text
    • https://cdn.sqhk.co/fedefuxu/ieibEhg/2145662255.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/9a091c35e0c43de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_603160c10897c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_604013a64a445.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/E6hja6o/cyberfoot_soccer_manager_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625ddd5903.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/xygdhaj/choices_stories_you_play_wishful_thinking_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_60498cec69039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6013f135e479a.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/LHjeXeF/best_deck_in_clash_royale_2020_arena_6.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/davarepovagax-lofabatakukaso.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/iduU3ek/gokixakapuweva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f304e87-158c-483b-8723-78996d9bcd59/ukulele_music_sheet_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fceca97e-018e-4ed6-af41-b44fa387b575/aa_4th_tradition_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079b9c9f-2003-477e-a0c6-71ccdd70c983/irobot_braava_380t_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2e41ec-d5b5-4874-a2d3-5e20e2998d8c/tesla_model_3_lr_awd_0-60.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/chesapeake_bay_fishing_report_july_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/coupling_of_alkynes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c4f305-b056-4d54-9776-78ba38e1d55c/kenmore_window_air_conditioner_filter_reset_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73331b6-a641-4df1-bc54-775c4c34f3f7/85055650218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178fdb9e-252a-4cd2-ba39-24a1b9fc356e/7502276537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d416159e-4551-4d9e-9ed9-465140fbe037/the_norton_anthology_of_american_literature_9th_edition_volume_b.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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5476 bytes
SHA-256: 8377edfc85ffe65de83ea2564f7bb534e52af91a3ce2c7dfdce83314f94fdc7c
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 11020 bytes
SHA-256: aeaec132109c745a6865d8b8dd41b2632061888a4fcbc9f16bf2d53081224dd5
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 12620 bytes
SHA-256: 8184f253a4d8a93f0becd0211031c6350ceb31930d32cc154011553860e54f6d