Malicious PDF — malware analysis report

Static analysis result for SHA-256 683f56aeed5fe5d1…

MALICIOUS

PDF

141.8 KB Created: 2021-03-20 10:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6e81940378cac82cf85892707c36121 SHA-1: 24ca77097125a42582b035cd9a38e00e818549e7 SHA-256: 683f56aeed5fe5d1764c067519369ba8ed2b8a09ab9250a61d3a5ce967620d9c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The primary URL, 'https://golowaki.ru/award?keyword=hindu+boy+name+list+in+tamil+pdf', is presented as a search result to entice users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://golowaki.ru/award?keyword=hindu+boy+name+list+in+tamil+pdf PDF link annotation
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/lowawavunad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_600c7d5294f02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5fc73563daa27.pdfIn PDF document text
    • https://niravewowinud.weebly.com/uploads/1/3/5/3/135343761/gevixekumi.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/wisupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_604010a43c52d.pdfIn PDF document text
    • http://fisukebisogovi.22web.org/war_plane_simulator_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fe3e44036061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_6012ac91b31a3.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/6th_grade_vocabulary_words_and_definitions.pdfIn PDF document text
    • http://kanosejimu.rf.gd/powerflex_700_afe_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/evil_morty_theme_piano_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/8768638716.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/cv_introduction_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/34135893643.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/bibenuniwawo.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/47220459381.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/dedilanobumimekozev.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/xexuripusadixagomev.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/kindle_cloud_reader_free.pdfIn PDF document text
    • http://jodamedorofile.epizy.com/naregurapemetabijobev.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/nofala.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/kodaro.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/song_talk_dirty_to_me.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001c62f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C62F 33112 bytes
SHA-256: 1a01df364cff8840d92ae619110dd2357235b08362208f2c3cae3729703bea8a
font_00_sfnt_off0001b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B43F 5292 bytes
SHA-256: 5ae4c862e6eb67fe6fff2e8385ec47afe6dbbbca997004d7378cae9bf6b4f3a7
font_02_sfnt_off00020550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20550 10412 bytes
SHA-256: fc96fdf8279bfb2b0b6f78183d38ab5cec83d179b53d5ff6b93a992dbe94bf6b

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