Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1ed21f051dec16…

MALICIOUS

PDF

82.2 KB Created: 2021-03-28 15:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec265b82a673b736fb85444a84b2f387 SHA-1: ee80a49c3e420bbec79bca743dd75149f73a70c1 SHA-256: ab1ed21f051dec160ad1e4925f98ce58da73b60821377bdaaf85315a504eb485
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URLs, with one specifically linked to a search query for educational material, suggesting a lure to disguise malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the PDF heuristics point towards a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=sociology+book+class+11+ncert+pdf PDF link annotation
    • http://zinujelazozud.22web.org/limiting_reactant_sample_problems_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_605bcb4e2f23c.pdfIn PDF document text
    • http://ig-soft-team.com/68599305542idayv.pdfIn PDF document text
    • http://hihikane.space/berliner_platz_4_neu_intensivtrainer_lsungenuirfg.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/6628084.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/3ghjfIz/hungry_shark_evolution_mod_apk_hack_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/6phaojb/cheap_bluetooth_radio_fm_transmitter.pdfIn PDF document text
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/zedidijonelomas_neguzujubekuvu_tagofawisixeli.pdfIn PDF document text
    • http://onlinesos.tech/84400690805ay1dl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_6029424109a3b.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/cishdgj/toss_em_all_reviews.pdfIn PDF document text
    • http://myfavoritesun.xyz/kavibuxujokamidefatewevfgjyd.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/bakigof.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/HKwhgCU/the_farm_at_walnut_creek_fall_festival_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fe112db67f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/hjjggiT/gewigudazexifatufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6048fdb3ad4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6032204a439df.pdfIn PDF document text
    • http://vuwazakuzasoz.iblogger.org/anr_old_songs_naa_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mojelol.epizy.com/android_9_samsung_s9_release.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/what_is_regularization_in_machine_learning_models.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/fifty_shades_of_grey_full_movie_download_filmywap_dual_audio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5784 bytes
SHA-256: 3ed3f7413f578aea8fb75e7f7d1ec2e43ce9e1b680fa4ab8ce2b6b8c2100c7c5
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 11032 bytes
SHA-256: 8a55d974cb3d0c1355c86c8121aab5f079ec1d0fd4aaf86c9534eb686bb8f1d4
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 3960 bytes
SHA-256: 01302bc7cf37effbc4c524a7885a02e74302239bdde3809ffc37fbb6b6d575d7