Malicious PDF — malware analysis report

Static analysis result for SHA-256 827e2dbfb81a3570…

MALICIOUS

PDF

94.8 KB Created: 2021-06-09 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 188e750912c25bd05474771a9f5a5cd0 SHA-1: 7629401a6c3ac5aae3a3a73cfc016e2afbcfe26a SHA-256: 827e2dbfb81a3570d70720e87aeb1a5951dc927d18cbbc1cd3d283b749beb880
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Physics for scientists and engineers 9th'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://irlanc.ru/pbw?utm_term=physics+for+scientists+and+engineers+9th PDF link annotation
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/nipug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_6012552e15d4d.pdfIn PDF document text
    • https://kurokeduzuw.weebly.com/uploads/1/3/4/6/134693898/sazapatu.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/3b121decaf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_6004a8de04013.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/jijuvutowavolewava.pdfIn PDF document text
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/235541624.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/9584a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_605268f7c2e5a.pdfIn PDF document text
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/5509613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a366bbd-01e3-4768-a055-571a2fcc0d53/1016661758.pdfIn PDF document text
    • http://kiruguwota.pbworks.com/f/mode_demploi_telecommande_climatiseur_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e203f625-e3ff-4a0c-8b4b-c81ca519416d/xakaxukukivikodawofafi.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/20764894260.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/xfinity_prepaid_refill_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8cd81d-fc11-4e8a-addc-dffbba35603f/separating_john_updike_summary.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/reset_bios_password_hp_laptop_windows_7.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144620619/67658965519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee61fd6b-1a6a-424d-8eb3-2fda13ee6ece/10635388866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5dfe4a6-c338-46e1-852b-b6245c737f39/kaxerefulevojamewi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 5512 bytes
SHA-256: 2d510475dd5adf8c7023b5cea54ceb6363f00e77c46d7243bd06f17a58e5309b
font_01_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 11628 bytes
SHA-256: 816073e94b02b8eafad7ad5c47a7c17840c5644607c5f4c5fe046ecd7c27e320
font_02_sfnt_off000156f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F8 16564 bytes
SHA-256: 58b9d7e123af020a4c48d176bab42215e441ad4a747fe043d0e9112ca12c8afd