Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a71bcffd42169…

MALICIOUS

PDF

72.1 KB Created: 2021-05-31 20:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8fbd2ff3daa8ffee7faac038c0963ec2 SHA-1: f2425bb5977f6e27750d3ac1c76dbc03aae127ac SHA-256: 123a71bcffd421699dea832ad23652533428a11babffe3728f170c8fcd76f633
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing the user to 'huntic.ru' under the guise of a free template download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 5

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/pbw?utm_term=avee+player+dj+visualizer+template+download+free+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386089/normal_606a46fc87f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_60035d1014126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5fdf5d60031c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_601878f889e5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff01affee64b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60152fb438ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_6017040dd8754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c346e4-ed4a-47ab-b1d5-72eb336f7e9a/is_splat_lightening_bleach_permanent.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144423687/fidelity_net_benefits_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bacd230-82b8-4438-b9df-0c4f55fbdb1d/how_to_get_good_abs_diet.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/fetch_decode_execute_cycle_steps_a_level.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144422358/jufojekibitox.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/pokemon_gba_games_on_switch.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144414639/skyrim_how_to_use_cbbe_bodyslide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2adb67-c1e9-47f8-9e12-0bbbb54a7ad4/51822357543.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/63382737998.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412638/88528917727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef4b012-68f5-4f6e-9c4b-e4dbd765d5cf/27721523191.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/where_can_i_read_the_untamed_manga.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144411960/how_to_clean_vicks_vaporizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6232d4f-1556-421e-83dc-653bd4556078/how_can_i_get_my_w2_from_walmart_if_i_no_longer_work_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13d19b4-d899-4b53-a856-a9615e94231e/61631071338.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/15614458775.pdfIn 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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5828 bytes
SHA-256: d7da51dd4c6719ed52b5091c64c6bf973bb4fbd14a7f6d6de3741fcf58dd751b
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10732 bytes
SHA-256: 712e864f3b70f24667940d9a98b7be6aae56f6948782c36c2c68d810e660ab37

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