Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a187d977bc2638…

MALICIOUS

PDF

83.3 KB Created: 2021-05-02 10:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a40992ca17ef222071ac821f38277e1d SHA-1: 276bf983c25808f50961b6138870990ea0e71c8f SHA-256: 58a187d977bc2638ceefaa11a23cc47885a6944ade3ef36a4833b19a2851c41a
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to copyright infringement, likely intended to trick users into clicking the primary malicious URL. No scripts were extracted, but the presence of numerous external links and the ML detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=how+to+send+a+copyright+infringement+notice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402737/normal_6001830cc6549.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/jZsyiWS/30079719296.pdfIn PDF document text
    • http://jopkapopka.online/raja_rani_sad_ringtones_download_teluguqwjis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_600628cccf52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_606b1d0f9977f.pdfIn PDF document text
    • https://cdn.sqhk.co/vabilafibalu/ieFhh2W/bunobawiwulafifufib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_6011e9fa77aa2.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jaiatQN/mojagetadimitebo.pdfIn PDF document text
    • http://usmileofficial.site/846567700805mfp0.pdfIn PDF document text
    • http://infonewstravel.com/40973268097repwj.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/gnPt5je/nenatosujepelemat.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/monthly_overtime_form_templatebtxy3.pdfIn PDF document text
    • http://findattime.com/77148804371j7uhq.pdfIn PDF document text
    • https://cdn.sqhk.co/fakolafebu/ggcWjed/95904474425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/gulejozuwatakuriboku.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_32d9c6f3c6da4d13962600cfa480a448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7045a7e-36f2-4e75-8897-23f9ac80de8e/43259276001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409f8068-af61-4998-8640-3f86ecc85311/ancient_magus_bride_episode_4.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ms_shining_movie_song.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_334a8930eadd48c5a01688c4353b93b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc72512-40af-49fb-8bd8-21180a968930/stuart_wilde_infinite_self_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ad2e7c-a069-43a4-b641-3166e7a344be/world_map_with_oceans_and_continents_labeled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d7739e-8986-4ee8-ba5e-e9289ce5959f/what_does_it_mean_when_your_boyfriend_winks_at_you.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_bb78fd67aae049e387db5881fead1e30.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 5692 bytes
SHA-256: ffdce6b8e67c60486d96f330a5cd852bce3abb633cc04837e3cffb2a5e64a6de
font_01_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 11080 bytes
SHA-256: 56e290a47a1b7ce805ca5881179be5354b2fc593edb690f350eb71b19a70a51e