Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a83b5e4a7bcf01…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 04:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14980a565d3397a64a5f39dd1e891e1c SHA-1: b1549df7fa90e36bfdb999e9bd555d1e9cc7b496 SHA-256: b7a83b5e4a7bcf018538503b36764ed5dc5776b9ef031bbe5e61668d0c451b93
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure the true destination. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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/aws?utm_term=ravpower+charger+flashing+red+light
    • https://cdn.sqhk.co/mujowofapubi/hLheDhe/centrist_politics_australia.pdf
    • http://toppiksnack.xyz/ruzofaturov02a4b.pdf
    • http://pinegobojefo.getenjoyment.net/how_to_make_procreate_pocket_full_screen_on_ipad.pdf
    • http://vixitatevejiwo.getenjoyment.net/burley_dlite_x_australia.pdf
    • https://cdn.sqhk.co/japedovak/Uughc7D/mohamad_ballout_net_worth.pdf
    • http://afracheat1.xyz/whats_the_default_password_for_linksys_routeri56eh.pdf
    • http://volulolusawaz.mygamesonline.org/2105184474.pdf
    • http://raisinshub.club/metformin_xr_less_side_effects5s1vp.pdf
    • https://cdn.sqhk.co/kixagixupo/LHDvvjf/bomopinelirexidekexox.pdf
    • http://kefets.xyz/all_snes_games_rankedv1b97.pdf
    • http://momentikshop.space/misasarp3xnh.pdf
    • http://classkaod.ru/bajotuwumazijukewasumifuipd.pdf
    • http://instapriz.online/what_child_is_this_christmas_song_instrumental7m7zq.pdf
    • http://dom-bita.org/74281832780v2l6f.pdf
    • http://kzrovk.xyz/geometry_dash_hack_no_survey_no_downloadifcb2.pdf
    • https://cdn.sqhk.co/wikelere/RZiepgf/80154921783.pdf
    • http://sexekovowo.iblogger.org/learn_quranic_arabic_app_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jarakuxajebo.epizy.com/how_to_compose_music_free.pdf
    • http://tojosigoxoxeje.rf.gd/kabuz.pdf
    • http://wenares.myartsonline.com/lista_de_100_verbos_regulares_e_irregulares_en_ingles_y_espaol.pdf
    • http://tezajiduzut.epizy.com/chikmagalur_tourist_guide_map.pdf
    • http://zuxifeka.epizy.com/19560057665.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_off0000e57c.bin
b4adf1cb616b9520f7c23a87eaf734367a17effd6c16e897e5e38b78e878fae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5576 bytes
font_01_sfnt_off0000f88b.bin
0e1c38fed1e74368387bc85f2149c0af584fab76fcac81fea737a2afda3368f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10816 bytes

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