Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac18b75e5c3d9cb…

MALICIOUS

PDF

77.7 KB Created: 2021-04-04 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dae328056436d57cb43f818ab4ba6744 SHA-1: ee2c4f3ee49e0a0b7e220006bef17a1d753d3b46 SHA-256: bac18b75e5c3d9cb5850806b0bc7215cdfe329383aa79b0567a08f1423698a0f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=past+continuous+past+simple+worksheets+pdf PDF link annotation
    • http://gaydating.world/angular_7_portfolio_template_freejlk07.pdfIn PDF document text
    • http://hookup154.site/kawupjnaly.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/haUiiig/red_balloon_song_tim_hardin.pdfIn PDF document text
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/2798122.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/cHhb12X/87406189110.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/hcEgcjc/football_2015_world_cup_2018.pdfIn PDF document text
    • http://localdesign.me/ryobi_31cc_weed_eater_spark_plug_gap7dmhg.pdfIn PDF document text
    • http://ontrade.top/how_to_say_god_in_sign_language8sbbq.pdfIn PDF document text
    • http://prodive.su/sixolepaluzumokakiwoparerd2a31.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/79fe962a.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/YgficRj/police_prank_call_number.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/madden_mobile_21_hack_no_human_verification_or_survey_or_downloadflqhc.pdfIn PDF document text
    • http://winoorama.site/faranizaruwuvapuditovuxa5ejcg.pdfIn PDF document text
    • http://good-production16.site/how_to_test_a_battery_tender_juniorm2os9.pdfIn PDF document text
    • http://policyhelpcenter.com/what_does_butter_whipped_mean_in_slangwoay4.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/XRjigd5/mtg_commander_precons_ranked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ba866b-306b-4da9-9c8b-4d81a9bacce2/11564255036.pdfIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_d54c2f9c3e54495d92ae4b16261786e0.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_ee142dadc2a049eab2ee46776accd475.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_88871c635e1343a485296f94a2411e0c.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_274ff3657d0345c39cdc498c06a4ec37.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_2282ddcacb044791937c54c2d0f40fea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aff0c92-8e2e-4135-9631-e41f590d49db/letuvunutujezajowawunixo.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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5552 bytes
SHA-256: c7a2837eebd1f402aa3fd5ce2bc0e22ee0e72222101f3a20367913cd74401b66
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10308 bytes
SHA-256: c44b18b9e6cdc0883b70b68e54cedc3b9a93dff976efe9a806e4258970331e1f

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