Malicious PDF — malware analysis report

Static analysis result for SHA-256 716f1858c2b2a0c2…

MALICIOUS

PDF

143.3 KB Created: 2021-03-02 15:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f049979250a3626c859918cf48620c34 SHA-1: 605935d7ee5a5dfcf3686d92a9e1d348aa1abd73 SHA-256: 716f1858c2b2a0c28a880e6edaec0bb4a542f4ff96b3f9d1cb7e7cfe2f97136b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, which is characteristic of phishing or spam campaigns designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=what+is+a+join+between+atoms+called PDF link annotation
    • http://warixedivukinat.mygamesonline.org/que_significa_el_justo_segun_la_biblia.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/jbzheo0/kawibiwesifup.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/todose.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/k4SghhH/57753709632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5ffec26785bf1.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/kihThdE/beef_packers_kuna_idaho.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/mjh5byT/standoff_2_hack_apk_money.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/fibgjig/snes_online_games_ranked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegozejixal.epizy.com/i_9_list_of_acceptable_documents.pdfIn PDF document text
    • http://fivulesesixiji.epizy.com/bmth_wallpaper_android_hd.pdfIn PDF document text
    • http://mejefelutirarej.epizy.com/food_voucher_template_word_free.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/absceso_cerebral_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/durham_reporting_centre.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/desingu_raja_ammadi_ammadi_song_free.pdfIn PDF document text
    • http://rezapemez.epizy.com/atif_aslam_2019_new_song.pdfIn 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_off0001f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2B3 5404 bytes
SHA-256: 7e9745a950e980b9380f5c1fe1475627747c5ac56689f5cf3f005c7172756875
font_01_sfnt_off00020504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20504 12944 bytes
SHA-256: 892a5ab071aae7579f77eb2c6db072c94c2c9bc0afa3217a47bcfb800a983df6

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