Malicious PDF — malware analysis report

Static analysis result for SHA-256 a953486a4d887cf9…

MALICIOUS

PDF

79.7 KB Created: 2021-05-01 06:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a5ac65659fb4d46b56b0e65125a3a9 SHA-1: 1b8788af1abf4afa0ba7f309585a32a8859177e6 SHA-256: a953486a4d887cf93fd22db71a8447e1d4d5b53a39f0f26120b6e6d44cc6c835
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=small+dvd+player+amazon
    • http://pixerofojoka.22web.org/animal_vocabulary_worksheet.pdf
    • https://cdn.sqhk.co/gelowidabik/yLhaW8o/equalizer_apo_microphone_settings.pdf
    • https://cdn.sqhk.co/mitajaso/dHPggBH/sensory_details_list.pdf
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/rafoxapumek-kifajiluk-lekebov-fobiniwukup.pdf
    • http://sarkife.site/gobinibibasusonj5u35.pdf
    • https://cdn.sqhk.co/nujamuxeg/hgvUiTL/chrome_webdriver_for_windows_64_bit.pdf
    • http://lnstagramverificationbadge.com/ajax_post_request_fileewm1y.pdf
    • https://cdn.sqhk.co/nogugojuri/ijejige/launcher_for_android_tablet_free_download.pdf
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/9c5b4ddd.pdf
    • http://kawonipedo.22web.org/tylenol_ibuprofen_dosing_chart.pdf
    • http://artdebug.site/rite_aid_blood_pressure_wrist_monitorsxq41.pdf
    • https://cdn.sqhk.co/vibesadebo/3rjijew/buratev.pdf
    • https://cdn.sqhk.co/vukupamita/Ijcjjjg/ouvir_radio_transcontinental_fm_104._7_ao_vivo.pdf
    • http://form-lnstagramverificationbadge.com/argumentative_essay_sentence_framesby35w.pdf
    • http://tiktokcopyrighthelpteam.com/p90x_abs_routinevemlo.pdf
    • https://desaboros.weebly.com/uploads/1/3/5/4/135400021/8221995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wivikisirijuleg.epizy.com/lekujozesufuzo.pdf
    • http://kinugokapa.rf.gd/ceo_delhi_form_6_online_registration.pdf
    • http://vabagez.rf.gd/59024860526.pdf
    • http://katewamopexo.rf.gd/social_media_connection_app.pdf
    • http://lumipanu.epizy.com/techno_pneumatic_cylinder_catalog.pdf
    • http://bipanotobewosa.epizy.com/el_cine_documental.pdf
    • http://wodasakuzetu.rf.gd/lekexakegojeke.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_off0000f8da.bin
4dd091ba21f1ae950c2f1db9ff3ba1d4089a54388231713caa377d2ab58233d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5240 bytes
font_01_sfnt_off00010aa8.bin
bd97d10a77abd2da6fea033fb57cf296d679ed89e24e8051c4c70fef0213b124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 11324 bytes

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