Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d95860dc66a99b…

MALICIOUS

PDF

87.8 KB Created: 2021-02-16 01:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 28bbf5aabbc0ff75dc4a494d79ae8380 SHA-1: 59fed4fcb222842f66503cfee1c773feb8979685 SHA-256: 54d95860dc66a99b0f9504222852f94683f0b4de73971c1bf112b39936845e75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it is likely a phishing or trojan distribution vehicle. The presence of a large number of external links, including one pointing to 'baarspo.ru', suggests a link farm or redirection strategy to host malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=reloading+bench+for+sale+near+me PDF link annotation
    • https://cdn.sqhk.co/safubuguva/KojbrS5/46375816312.pdfIn PDF document text
    • http://meetraisins.club/2145156723887k26.pdfIn PDF document text
    • http://stikc.xyz/101_ready_to_use_excel_macrosoc3pk.pdfIn PDF document text
    • https://cdn.sqhk.co/balijanawi/Ghgghia/dj_song_mix_gana.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/active_passive_transport_worksheet_answersdbaix.pdfIn PDF document text
    • http://price-list.moscow/bivuvuvire934u6.pdfIn PDF document text
    • http://biotringel.shop/huffy_bike_sizecp986.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/gcjijge/cheetah_running_speed_mph.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/5855424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikutixutawax.epizy.com/idrivesafely_permit_test_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/video_er_apps_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/ceilidh_band_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/analgesia_and_anesthesia_in_obstetrics.pdfIn PDF document text
    • http://muvelexadaw.epizy.com/9865910803.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/beyblade_burst_game_ppsspp.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00012ba9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BA9 22384 bytes
SHA-256: f365bf639d724895047619de8164182620a4af57ef371516f6231b3ccb30474d
font_00_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 5580 bytes
SHA-256: 2915e8e1e35d4bd7d4a730decbd409fb88307d2a38b9a6837cde822cd1ff379d
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 11308 bytes
SHA-256: 333deb2337a87bf326c296f03a4ba06a29af2051404eb66fdf13abb9b27aeb91

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