Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c107b7406d2956…

MALICIOUS

PDF

71.4 KB Created: 2021-03-24 17:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2413f69045d036b4443a2b7ff50e5d03 SHA-1: 4a1ae85efc588d1262890a22f1279998473be14b SHA-256: b5c107b7406d295656a736d9e5e668ab0b6718082f2af37c761412362d39a1f6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text suggesting it is an answer key for an English grammar book. ML classifiers and ClamAV also flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=understanding+and+using+english+grammar+3rd+edition+answer+key+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_604f05e4af743.pdfIn PDF document text
    • http://itverys.space/clinical_psychology_journalsqy72y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd001f1e1f.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/Siahfhe/7225900499.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/82955277686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6041b222a965b.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/jasogomofatafex.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/whch9ii/rukawijipolidiruz.pdfIn PDF document text
    • http://medgaj.com/ejemplo_de_memorando_simple_en_word5cw9o.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/igjhbxA/plants_vs_zombies_plush_super_brainz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_602f2cfdb50d5.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/how_to_check_my_system_specs_windows_10.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/parinuxabaxowi.pdfIn PDF document text
    • http://filemarker.store/what_instrument_is_used_to_measure_temperature_of_the_atmosphere2bl3z.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/OYHEgfY/calendario_serie_c_2018.pdfIn PDF document text
    • http://itverys.space/shiv_tandav_stotram_lyrics_and_meaning_in_englishgp9w7.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/pjf4mXu/72599210092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/google_account_manager_5._1_1_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/lotenugakezur.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/tera_bas_song_pagalworld.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/pereseneledupamadewok.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/line_6_spider_ii_30w_1x12_guitar_combo_amp.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/bagakafewipuxuwowowakukow.pdfIn PDF document text
    • http://dizoleline.epizy.com/binomial_distribution_python.pdfIn PDF document text
    • http://papumubi.epizy.com/vapibifewaserupefisad.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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 5868 bytes
SHA-256: 03ff169fa827494b40570e79a049f584951458cf93172244a34b0a13f0535b2e
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 9976 bytes
SHA-256: c02c1148e9861a146507260f0ede5caa82d1f621234ad33d809c2c670c354faf

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