Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff90eee3bc97a96…

MALICIOUS

PDF

82.3 KB Created: 2021-05-01 22:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c9048c89096f4b5ad508cf0d24e41180 SHA-1: 5de2922ffeabf0477b421dde8a72c562e8fa84b0 SHA-256: eff90eee3bc97a96ea904fb71a9c8bab65e6448d1d8c1af10631e71f47091756
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 0.9996

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 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://druttle.ru/strik?utm_term=how+much+is+brendan+greene+worth PDF link annotation
    • http://olymp-trade.top/7698494696922tw1.pdfIn PDF document text
    • http://venupalu.iblogger.org/broken_love_meaning_in_hindi.pdfIn PDF document text
    • http://meetsucre.pro/lucky_jim_minef33sf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_600355124fb54.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/south_park_season_10_torrentmga1t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_6012784a80bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_6047ed42bf785.pdfIn PDF document text
    • http://intereriia.com/pufodovubozokaffj19.pdfIn PDF document text
    • http://iranianvc.com/24480515175pkw17.pdfIn PDF document text
    • http://dibuxovowo.iblogger.org/promissory_note_template_payment_plan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://paxubar.rf.gd/53441583960.pdfIn PDF document text
    • http://popeladidet.epizy.com/hospital_pharmacist_cv.pdfIn PDF document text
    • http://wafutevulutud.epizy.com/59773630453.pdfIn PDF document text
    • http://zivomunigewelo.rf.gd/72778298963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5796e48-296e-4c5f-87f7-d141b4fb8df2/sex_education_season_2_episode_1_ending_song.pdfIn PDF document text
    • http://boxitevu.rf.gd/40368134214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfaf7301-a5b1-455e-a5fd-2578a77aabd4/42678455561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c766ad9-6c98-4df9-8695-ec55e5e932e7/kingdom_books_and_stationery_price_list.pdfIn PDF document text
    • http://wowesuwufurofak.rf.gd/39310285087.pdfIn PDF document text
    • http://jolurula.epizy.com/ritter_m9_ultraclave_error_code_e004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e69db2a-519d-461c-bed4-1bdd67c2746c/xfinity_remote_program_tv_xr2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 5396 bytes
SHA-256: 7524334949710c9cbb2aaccf4878ec29a9a2bb15deec5b18405fbee22831d49f
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 10484 bytes
SHA-256: 7087b210e88ceda10c29c74e5122b3d2b708b98d1d7a49842d3a2a07b19b4981
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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