Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c509fb43a29c99…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 01:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 09e2e22748995fe399c2ffdfedaefed9 SHA-1: 5034d2fffc1717e28a3a745d3642c5e63260424b SHA-256: b8c509fb43a29c998abc6b24241fa4e34eae2b7cb56da4587e0180b1a79e2c1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, with one prominent URL pointing to a suspicious domain associated with keyword-based redirection. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery.

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://jottigo.ru/wix?keyword=active+and+passive+voice+worksheets+for+9th+grade+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379742/normal_6027ba8a0860b.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/behavior_intervention_plan_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5ff215051f3a8.pdfIn PDF document text
    • http://woviregawafokal.22web.org/xetelujaxaza.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/causes_of_depression_among_students.pdfIn PDF document text
    • http://sexapixir.22web.org/70567448784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_600835b256152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_4c94a0d0763145bbaf29596f91d79db5.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_3e8285bc4720404ea91b646377a1bd8d.pdf?index=trueIn PDF document text
    • http://kulebosux.myartsonline.com/cephalosporins_classification.pdfIn PDF document text
    • http://pobiludorigogok.epizy.com/24157221329.pdfIn PDF document text
    • http://kujujigufa.epizy.com/95265713781.pdfIn PDF document text
    • http://gezibetaw.epizy.com/national_library_kolkata_reading_room_membership_form.pdfIn PDF document text
    • http://gawuvuv.epizy.com/bakizigumokijawav.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/10787894804.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_40a4878260b34733b3a13ac903946f0c.pdf?index=trueIn PDF document text
    • http://dejoruxebesinem.rf.gd/simple_workbench_plans.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_f6c931b484c946d9870a1be723824bab.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_a3bfa51d2b8c403ba8e11c954dbef45b.pdf?index=trueIn PDF document text
    • http://zejibanunepi.myartsonline.com/tisadegorikilu.pdfIn PDF document text
    • http://zigolura.rf.gd/stand_by_me_ben_e_king_spanish_lyrics.pdfIn PDF document text
    • http://livivisobozi.rf.gd/44492975703.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_240e380e94e3478ca50c18d43fd79483.pdf?index=trueIn 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_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5744 bytes
SHA-256: fd4888e9de7623708ba126b9a62aa848c76579c742af2d29d29af74f3fc33601
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10760 bytes
SHA-256: b974d5cbbb7e75e6b9966d5f0b960a7a884163c8d132dcd52a2df4905ad3ece1

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