Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ca673f43b4a595…

MALICIOUS

PDF

80.6 KB Created: 2021-02-17 20:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2bef94e687567a093c77b1570574fc2e SHA-1: 4e49df6987b954986335967b3fbeba87253cc210 SHA-256: 91ca673f43b4a59552cbe87a1aab4c763fce05de53c85be98fbbac3dc4fbd327
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'bologen.ru', which is likely the destination for the phishing attempt or malware download. The document body, though heavily obfuscated, contains text related to integral calculation, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=calcular+integrales+paso+a+paso PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/hbUgdhb/didi_food_delivery_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/jf1if0Z/44088165240.pdfIn PDF document text
    • https://cdn.sqhk.co/munuzimevu/d4gdZii/losomifagesogewubajewilis.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/gIHhanK/best_rechargeable_aa_batteries_uk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/bByihui/dafub.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/gf9ojco/soccer_superstars_gamevil_download.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/qKJ0jdk/47027751268.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/7heagcW/puppy_wallpaper_for_iphone_7_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/ghTjcig/dematijoziwigasef.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/X5geSjd/intel_hex_file_merge.pdfIn PDF document text
    • https://cdn.sqhk.co/dumudegurit/hiGiajf/just_dance_controller_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/moxufupog/Ven3hgu/38535713593.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/WghGLif/business_accounting_degree_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/4hebD6Y/multi_stream_transport_mst_hub_hdmi.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/iach2LA/kesabudivegered.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/cgh4ggu/61757753080.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/jigcEgh/imagerunner_2520_toner.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/tjhfusA/neighborhood_market_pharmacy_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 5008 bytes
SHA-256: e388f6c9a1e7fc686df8f8304545666bd349c0f3916c04846e08df85a7a6cde0
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16108 bytes
SHA-256: 5051700de4f6600ef7b28fad96a7201bc6cf36b84955fcb7ae4019dc9eb94c32
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 16080 bytes
SHA-256: e3d583ca8131484f6b7e9991674a220a85ec8466745261d702706f92b0246cac

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