Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad098ed0ca3cce7f…

MALICIOUS

PDF

72.4 KB Created: 2021-04-04 06:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127948c33dd006668fd2dc4de205e62c SHA-1: dc2d76ece6648d7aeab5cb34626e512a41a304bf SHA-256: ad098ed0ca3cce7f289bdb555e43f6d512e3799fc3cdf5cfda5010cd8ec493d1
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic and potentially distribute malware. The embedded URL 'https://mezovuduw.ru/wix?keyword=world+history+unit+8+test+answers' suggests a lure to attract users searching for specific content. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=world+history+unit+8+test+answers
    • https://cdn-cms.f-static.net/uploads/4381302/normal_603fb86f61711.pdf
    • https://cdn.sqhk.co/tisezalave/ihQhcgX/my_natcom_application.pdf
    • https://cdn.sqhk.co/rorajakura/gdijdrF/doom_eternal_dlc_1_release.pdf
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcc1d1c8f3f6.pdf
    • https://cdn.sqhk.co/genizataxom/idPhf4W/bunirunete.pdf
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fcc443cb10dd.pdf
    • https://cdn.sqhk.co/gigepiwej/hdhcQia/rap_beat_creator_online.pdf
    • https://static.s123-cdn-static.com/uploads/4402488/normal_60039c21ddc1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fifuto/61006754154.pdf
    • https://uploads.strikinglycdn.com/files/07a3d965-cb19-45fd-ab34-37b9f8df2cd1/excellent_definition_of_climate_change_simple.pdf
    • https://s3.amazonaws.com/sazixipame/international_marketing_group_newsletter.pdf
    • https://s3.amazonaws.com/zijivevip/tv_show_fbi_episode_guide.pdf
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_4f48f99dcb4b4e38959de3c9496357f4.pdf?index=true
    • https://s3.amazonaws.com/safenalavojuwu/98703919210.pdf
    • https://s3.amazonaws.com/babetafaperaxov/how_to_replace_jbl_flip_battery.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_a9e1a9bca8b340bb9e25b0f03a88f70a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b70a100c-d2f0-452d-b004-2747631e65a5/48900876465.pdf
    • https://uploads.strikinglycdn.com/files/f1df9f17-50d8-49bb-9dd6-1a17d0294f7c/45262027961.pdf
    • https://uploads.strikinglycdn.com/files/5ddeedf4-5827-41e8-97bd-6834fe325961/siwegaxopogon.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_d7393d3ab2e74b2d8b54b41c2d70b0b5.pdf?index=true
    • https://s3.amazonaws.com/radubozufiwo/55711620348.pdf
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_d7fcc61a8a624db38977dc2a8704e277.pdf?index=true
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_497f77d53bb34653a610c44bc8ddb034.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d3aa714-0b65-402c-a19c-febbc038ebaf/56469293639.pdf
    • https://s3.amazonaws.com/bededuxotulapil/business_process_description_template.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/genus.pdf
    • https://s3.amazonaws.com/wozoxub/movie_box_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2d.bin
74b6e2b1a5542372cf421f257d462594ce1c2a6e9e090c469142b81cda430c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 5312 bytes
font_01_sfnt_off0000ef4c.bin
0768d2cfe162f68ab23d61edf5edc69a2000ed199a432bc619bea0a3dcb37a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10640 bytes

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