Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a237e602e88290…

MALICIOUS

PDF

75.9 KB Created: 2021-04-22 09:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9aa50c09849c8fa436234ace420e7163 SHA-1: df67cb5e5eeb09e2cd88d2b2dcab89a01c2c6d1a SHA-256: 50a237e602e88290d9bd1862318b7777b14b7831dc3c34d6db2d58644ae1ebc4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=how+to+make+easy+origami+rose PDF link annotation
    • https://cdn.sqhk.co/puzukebejas/XhcCVFc/48302991268.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/79782594940.pdfIn PDF document text
    • http://osmosiotzs.fun/zevisitamewaxup42ldv.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/dungeons_and_dragons_collector_booksjvaya.pdfIn PDF document text
    • https://cdn.sqhk.co/likunubiba/f2n4Ehb/download_toca_life_hospital_mod_apk.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/97803147559.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/einstein_biography_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/PieT1Xs/90702177435.pdfIn PDF document text
    • http://biweekamnf.com/pemiwi8agxu.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/odisha_b._ed_question_paper_2020_download.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/zabelevodofowi.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/cwjeShh/59564041650.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/XYBJ6yX/fuganuzevawu.pdfIn PDF document text
    • http://allieshouseofhope.com/devexpress_xtrareport_add_subreportagoih.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/gUmbqI5/bipemojidolurufobiweb.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/et3yQI5/ridikasinukofidigo.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/ib4cHig/jiforakukinimo.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/creative_thinking_questionnaire.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/janPhjR/ahly_vs_zamalek_match_today.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_08eaa68b055647e2b3a8dafaa1d933b5.pdf?index=trueIn PDF document text
    • http://dapufojutujat.atwebpages.com/wosolaruviziritetox.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_fa683cb17ce14c5498539154d78a4180.pdf?index=trueIn PDF document text
    • http://buzanuziti.myartsonline.com/music_and_movement_activities_for_early_years.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_89b279f6b6a14c859661ed0a6b45eda1.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_23ff7bf8f81d4c6a969dca5471cb5092.pdf?index=trueIn PDF document text
    • http://magegefopo.atwebpages.com/zuzedarigaseke.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_cd5fd92f4d7a4b6f85f073c0c05ddfe6.pdf?index=trueIn PDF document text
    • http://tuzuxutetug.atwebpages.com/castrol_5w40_edge.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5192 bytes
SHA-256: ddddcbbaba9421bda61de988e68906b4dcafd3d54d59d259ccc3c304a766ff3c
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10556 bytes
SHA-256: d0ee3153277abddb88b090ab3d06e03438f2cea09ba4ef1e74bb2be109413446