Malicious PDF — malware analysis report

Static analysis result for SHA-256 786b648f1600f84d…

MALICIOUS

PDF

69.3 KB Created: 2021-03-27 20:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86e42dccd2bf817a2f8cb038427e373c SHA-1: 5e6026ad69ec23490652516e03a94b0563d708df SHA-256: 786b648f1600f84d0fde9c7f359a0157e4873d4642b903742a324bda679406e3
186 Risk Score

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 0.9996

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://ponafet.ru/wix?keyword=words+starting+ph PDF link annotation
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/7657900.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/761485.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/zufojegokufaka.pdfIn PDF document text
    • https://xapugugividus.weebly.com/uploads/1/3/5/2/135298581/tenukifowijazon.pdfIn PDF document text
    • https://sewajevujunu.weebly.com/uploads/1/3/2/8/132814136/lulevu_tumalawuz_wixenofigitu.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/bissell_proheat_plus_2x_troubleshooting.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/mazatelirefolegofif.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/sitoxedodufojuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/chrome_version_69.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b419a50e-a15d-43b6-aefc-b90f491ae0c1/48222924076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d45183c-2654-4549-b8ad-9d13bc9cd864/nipofelexodifit.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_f1bfb653795c4feabe527b3e8be4882b.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_be13789721634b2b9732d89d69067290.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f557ca25-247f-4309-aba3-123769949279/to_kill_a_mockingbird_summary_chapter_1-9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a6abf4-8f27-4c63-8be7-70f27946e05e/is_boo_grown_up_at_the_end_of_monsters_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/75952731227.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_da771f27c3484eae80224c1dbef67752.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/28790666485.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/reresuwig.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_3f10a10288d449a4b1f3cf6ef6d0aa87.pdf?index=trueIn PDF document text
    • http://doriponesarom.myartsonline.com/vadawuboxebanab.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/is_autocad_useful_for_electronics_engineers.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 5200 bytes
SHA-256: d8a0d5d028ecadec92fc3a98190332c6c5cd47419366212a631c8e8beebd5e95
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 10424 bytes
SHA-256: 042c1a8711b22576e3f1f489c27dd16abd848ddc1513488d6278d7657a54814b