Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71c9985f5e5a30…

MALICIOUS

PDF

74.3 KB Created: 2021-05-08 11:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5c1e3fff8e0ef562b7ca07e612e6af53 SHA-1: 200f62d44ae109d497d8964b37686e503f5d5588 SHA-256: fd71c9985f5e5a302fc3975c59726344b58963b411674be05f197ca3117021a9
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. It contains an external URI and an image lure pointing to an SEO redirector, suggesting a phishing or trojan delivery attempt. The document body, though heavily obfuscated, contains text related to typing speed, likely serving as a lure to entice users to interact with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=what+is+the+average+words+per+minute+typing+speed PDF link annotation
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/1504657.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/nipevagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_6035464b88a0e.pdfIn PDF document text
    • https://muvavibati.weebly.com/uploads/1/3/4/6/134669950/3fcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6011e2b21bfc4.pdfIn PDF document text
    • https://cdn.sqhk.co/dumotometapo/hhefjjy/cyberpunk_2077_countdown.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/autocad_3d_commands_in.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/asus_rt-ac68u_cpu_speed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_604cc37bcf051.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/efOjggj/ropogilunerulejegesevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_60294463b6d30.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/pesiw.pdfIn PDF document text
    • https://durajonuz.weebly.com/uploads/1/3/1/3/131383269/5564213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/36155913644.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/gelabexasajefutefuratuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/dewinalelisi.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/wulunusujutavagotot.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/reading_actual_test_5.pdfIn PDF document text
    • http://xadilopavut.myartsonline.com/kedebevonoziko.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/a_level_chemistry_revision_notes_ocr.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/gaspar_noe_love_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/formler_bedriftskonomi_og_finans.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/kitchenaid_artisan_175_stand_mixer_ice_blue_5ksm175psbic.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/darebawiwimedekera.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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 5608 bytes
SHA-256: ed972f039725b3c72ac26fc5bbc8599ed1329820fced9155b9c64949a28de397
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10776 bytes
SHA-256: c8c6468580873cf52d4ad9d81cc56029fbfe287a3f9ee367f285ccb4e6485285