Malicious PDF — malware analysis report

Static analysis result for SHA-256 689e7bf2483cf5db…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 19:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 98c1b12231c65b742e3685cd836b6935 SHA-1: ca0e976900b433e237df327d84cf4e317fb09427 SHA-256: 689e7bf2483cf5db296eeaafca01fe9935590d5b4a7cf7152890e42456463195
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://druttle.ru/strik. This heuristic, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=romeo+and+juliet+law+west+virginia PDF link annotation
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/fixela_sikadifidevub_kumapa_kulijud.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/0d38664c7596.pdfIn PDF document text
    • https://cdn.sqhk.co/roturoda/OJVhhia/apple_screen_time_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/jroCgco/appradio_mode_vs_android_auto.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/84ef608.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/iahjfhf/flower_garden_yoshi_s_island_meme.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/jixonakosifufi_fotavaluwiluz_fedojurujilana.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/2VjaKhj/57620224572.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/lulusolenoniju.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/f191fdf4d64e7a0.pdfIn PDF document text
    • https://satemegozujig.weebly.com/uploads/1/3/4/4/134477909/kuxuzafapimoni.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/683c7704967.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/sinamozagemoger/meiosis_reading_comprehension_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/luxodafetikedejokaxube.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/99442669394.pdfIn PDF document text
    • http://topuwagib.epizy.com/bein_sports_connect_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/wozajasum.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/electric_slide_dance_steps_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/ielts_common_speaking_topics_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/zafazedot.pdfIn PDF document text
    • http://bidasumibave.epizy.com/ruririkefibowuwakele.pdfIn PDF document text
    • http://vipotunopadilez.rf.gd/tezunikiluw.pdfIn PDF document text
    • http://runumap.rf.gd/rental_agreement_template_free_printable.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5380 bytes
SHA-256: c54d6cd73266f33e083de9e71406fa15d57d68e9e4f9acc09ff9693971f33aff
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10668 bytes
SHA-256: ab7e9f9171e403149a7b6fccca7bf5638f2bccad366d563b4764e001785edbf5

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