Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f7e4552067a034…

MALICIOUS

PDF

73.3 KB Created: 2021-04-05 05:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f3c5fd21fc25c5710eba6e9fb5d30a12 SHA-1: 5588e4946a0912e0b2916fc103204c4267ab4a7b SHA-256: 12f7e4552067a034d0a0045c017e7157ccdef10fb3f3ce8477c1a259cbc25e77
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 hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=gtm+assembly+manual+pdf PDF link annotation
    • http://gukimunejorupod.iblogger.org/honeywell_wireless_smoke_detector_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5fda89edc13ad.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/hidrocefalia_y_anencefalia.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/maze_runner_trilogy_4k_blu_ray.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/acromegalia_y_gigantismo.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/jajosajuzapurila.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/7jjgc2Q/pofixejazukusaduputojiraw.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/hc3iaPX/sidefimolozujabeduraj.pdfIn PDF document text
    • http://kejamezegujoz.iblogger.org/wallpaper_3d_photo.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/hhhejcF/why_does_phospholipids_form_bilayers.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/dKHiil7/bakozatedekaxewesomevi.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/eiQhaic/bugsy_drake_age.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/fisilalazoxabojujetuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_602f5d22df88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dereduvate.epizy.com/bihari_gana_song.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/94808495423.pdfIn PDF document text
    • http://bosirizowu.rf.gd/42670617215.pdfIn PDF document text
    • http://godavuvexo.epizy.com/makalah_descriptive_text.pdfIn PDF document text
    • http://wegefug.rf.gd/which_university_is_best_for_supply_chain_management.pdfIn PDF document text
    • http://xirewubekato.epizy.com/certified_network_defender_book_download.pdfIn PDF document text
    • http://fizinesunav.rf.gd/malayalam_books_download_free.pdfIn PDF document text
    • http://dexixikix.epizy.com/assamese_video_bihu_songs.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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 5364 bytes
SHA-256: cb221a85a8563b712764bdfe0856f332b9f229648dfbe296f2b8f6d6a71393a7
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 11012 bytes
SHA-256: 4d6a119929e177181724fc7dba5367f4a7c1b530fba39a81c83fbf7d7e563966

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