Malicious PDF — malware analysis report

Static analysis result for SHA-256 4052bbcdb7988f51…

MALICIOUS

PDF

78.3 KB Created: 2021-03-06 15:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 96a901750d505803160c7af2f745e602 SHA-1: ba96903cd77c7d8f01a992dd93caaa99e866e495 SHA-256: 4052bbcdb7988f511d38777ff2afe59caa7b68180481e30ff7cb281070c5de3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text that appears to be a lure for search engine traffic, directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=best+spider+man+comics+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401982/normal_603ee241371c6.pdfIn PDF document text
    • http://bestsaleshopin.xyz/how_do_i_get_arborist_certificationasktp.pdfIn PDF document text
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/luxilosef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_6039657157cae.pdfIn PDF document text
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/zupuxabexikig_lezexafetimodu_logisemat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fddcf7ebb0dc.pdfIn PDF document text
    • http://erogan-oficial.site/alex_cross_series_in_order_amazoncye1r.pdfIn PDF document text
    • http://aviabileti.ru/bpsc_mains_question_paper_60-_62fe93y.pdfIn PDF document text
    • http://ontrade.top/korigujuniwiri9xbsh.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/domesekafaxedox.pdfIn PDF document text
    • http://kanshoper.site/machine_learning_python_tutorial_for_beginnersra74t.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/33696125874pol8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_601f032eb6349.pdfIn PDF document text
    • https://zaderurumanig.weebly.com/uploads/1/3/4/5/134588260/motibaxenojaforap.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/jirepozodapulosuruj.pdfIn PDF document text
    • http://www19216801.site/sotituzewufoweyfhz4.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://kuwubuvorij.rf.gd/25332938219.pdfIn PDF document text
    • http://nivunurawusaxo.rf.gd/19372410262.pdfIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_7ef94902578e49d4bbf60107178bfd2f.pdf?index=trueIn PDF document text
    • http://badizep.epizy.com/reading_passage_caveat_scriptor_answers.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_4a7324b2554d424a89fccaf294f05b5e.pdf?index=trueIn PDF document text
    • http://zesubilav.epizy.com/25509965310.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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5024 bytes
SHA-256: 33556f68dcc8f1762194e89bb6f6dedbfa6e8ab77653d20d3897bf04808400b2
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10688 bytes
SHA-256: 51366222a651966c57f688bf46f9fdf6873b4ecfb454e3e1a08b3b0ba3b09a7d
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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