Malicious PDF — malware analysis report

Static analysis result for SHA-256 488c87b83954e5ee…

MALICIOUS

PDF

74.9 KB Created: 2021-06-09 10:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1eceb220e6406ee410eb9b9a99735ddb SHA-1: 934bd658881aaa15f2055256e8f8645d4cde2a1c SHA-256: 488c87b83954e5ee731c994d4cbd3dbd53c8a05fb63e9b934c00f99085375f62
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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://chcial.ru/pbw?utm_term=best+book+for+learning+english+speaking+pdf PDF link annotation
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/9293405.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/6232eddfefaf3c2.pdfIn PDF document text
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/binufi-gasenerel.pdfIn PDF document text
    • https://wawizaliw.weebly.com/uploads/1/3/3/9/133986908/fepuxom-jikewizule-lirasug-mevarijudone.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/sojimepire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazupamufode.pbworks.com/f/how_to_detox_my_liver_at_home.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/jikagomomiduz.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144448200/rigozifasumejifemilok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f18687a-cb7f-45fd-bb65-64475acd7495/waveworuwipaviwisesugu.pdfIn PDF document text
    • http://wixumip.pbworks.com/w/file/fetch/144812790/19695726099.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/f/50581412470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f66b06-7827-495b-9ba6-60e3a0e086cf/how_to_draw_a_side_face_girl.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/92090665332.pdfIn PDF document text
    • http://pevaludim.pbworks.com/w/file/fetch/144910524/need_for_speed_most_wanted_night_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4096bce-1d93-4f72-9e32-5c4778a23b86/kimujilubovefonezum.pdfIn PDF document text
    • http://kemulosomul.pbworks.com/f/behavioral_corporate_finance_hersh_shefrin.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/zasifulovibarexo.pdfIn PDF document text
    • http://subazim.pbworks.com/f/how_to_make_a_timeline_in_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66025404-8cc0-4f3d-9731-c4fbb58fd98f/nazm_hikmet_ran_iirleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a335f1e4-80bd-4716-96ff-0d4dd60e15c5/wexuzem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9281c054-fdfb-4b6d-935b-00f321d3e3df/4461820238.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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 5556 bytes
SHA-256: fed698bace334b4ded1b9339ccd27e9cb488257d2071ef9e2db494bc02d2ebfb
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10356 bytes
SHA-256: 21a0a866ec7fce7e4e171e4187d095dd71400e1820180e5349d6e91a7e56bd07

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