Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc81cf67f47cf81…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 18:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0da1da01aa46635718dcd7ab2abca7 SHA-1: 206b77be66dfa9c8de076a46e2404d0e76ea344a SHA-256: 1dc81cf67f47cf819c7dfd509c42e71b96d07c7acffb1630127a4f66d6706986
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'pelibifir.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'manual treadmill'. No scripts were extracted, but the PDF structure itself likely exploits a vulnerability or uses embedded JavaScript to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=exerpeutic+manual+treadmill
    • https://cdn-cms.f-static.net/uploads/4414869/normal_604d3fcf523bd.pdf
    • https://cdn.sqhk.co/juzivadareka/m5ubCgg/79376037160.pdf
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5ffb5a885c6ea.pdf
    • https://cdn.sqhk.co/gasubapo/wKAN6hd/mivubodelaxozateraw.pdf
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6057a7b4b7d52.pdf
    • https://cdn.sqhk.co/mareduviger/w7djcnA/bangla_baul_gaan_hd.pdf
    • https://cdn.sqhk.co/kinanunir/flMpUhg/surah_e_shams_benefits.pdf
    • https://cdn.sqhk.co/weruvewo/jcbFhhT/rtc_bus_mobile_app.pdf
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5fd789880659b.pdf
    • https://cdn-cms.f-static.net/uploads/4471481/normal_605d8a5eadfd3.pdf
    • https://cdn.sqhk.co/nizekidido/jc6Jhf2/jezajegofopemema.pdf
    • https://cdn.sqhk.co/xegunorasu/jahcjcl/kogifowizobifovubujizut.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/ehfRDEO/condado_puerto_rico_restaurants.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5fd318a870de5.pdf
    • https://cdn.sqhk.co/xajimujigaju/h49Riac/wrestling_revolution_3d_2020_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4419192/normal_5fdf079300fbf.pdf
    • https://cdn.sqhk.co/jojipimuve/iaiiDvb/cannot_remove_screen_lock_pin_on_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a85f99fa-4fc6-4d2f-aad1-8210e9ad5a6f/9th_grade_poetry_terms.pdf
    • https://uploads.strikinglycdn.com/files/05d9a172-9972-4110-8f1c-2dcf096f889e/highway_capacity_manual_2016.pdf
    • https://uploads.strikinglycdn.com/files/5a54e057-55f1-4a8a-8cb1-7ff20210af40/giratosiwutowirota.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e649.bin
9b4f0b8ca36954b28056466d94259be4ee590feb0977a349d73a217801072d08
pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5068 bytes
font_01_sfnt_off0000f773.bin
0b8c7bdbb6650f1eb5728d6b874d6879f037e29c6951ad46991e1957d14faf97
pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11088 bytes