Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e71f031c663230…

MALICIOUS

PDF

84.8 KB Created: 2021-05-15 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a67172b7fd6e599c4fd654415636734b SHA-1: 3c6328770e97e12a46db0283dbaa80a039418ffb SHA-256: 88e71f031c6632300377a5e7312e03172100e05c557dfccd7aadb39b84742408
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic indicate the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/strik?utm_term=what+is+the+best+recreational+activities PDF link annotation
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/savaxopapuvivifafog.pdfIn PDF document text
    • http://volosaty100.xyz/mathematics_all_symbols_name4s5sx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_602e021eddcab.pdfIn PDF document text
    • http://brumbum2.xyz/46634350851wpcy.pdfIn PDF document text
    • https://fisusaweku.weebly.com/uploads/1/3/1/8/131857315/7407667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415934/normal_60082e049b299.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/ijjzJig/my_talking_tom_friends_apk_mod_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5fd63264bef65.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/nojanupawe.pdfIn PDF document text
    • http://cosmostil.top/1991_acura_integra_repair_manual_free_downloadepuyz.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/eijxjip/guess_country_emoji_quiz.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/9pm_football_managers_apk_android_oyun_club85cii.pdfIn PDF document text
    • http://bigwin-1xbet.fun/77970741033pqp20.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/phehcha/39265534211.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/senopori.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/jjV3gex/pusafegoloxorapaduwogime.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/0jcJWgf/sound_physicians_emergency_medicine_of_texas.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/cc4766ad.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/journeys_3rd_grade_spelling_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e47534-e2da-4790-b47f-03153de17f3b/behringer_xenyx_x2222_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9291a0-4f04-4753-b81c-5574b27a0ad4/58212216782.pdfIn PDF document text
    • http://nutonujisebife.epizy.com/wekomizesexudusegilutaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872cc520-f6e7-4020-bf6f-26392c54fc9e/how_to_draw_a_fashion_figure_for_beginners.pdfIn PDF document text
    • http://xatidewivi.epizy.com/functions_of_the_brain_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 5100 bytes
SHA-256: 2d7a62250e79086ef1cfa9bf90a7f83a7ce94bb5768510826c2424ef503a962c
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10552 bytes
SHA-256: 0d25316701177d035db3ac7226fdff4a727767f8a2d838756d4871a98555b369
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330