Malicious PDF — malware analysis report

Static analysis result for SHA-256 3577d65a4e79b3bc…

MALICIOUS

PDF

88.6 KB Created: 2021-06-09 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90611bf65e6822a4fa7eefa0a3d42b69 SHA-1: 42bf579525a80171a04aa92e7257084ff355cc2a SHA-256: 3577d65a4e79b3bce11b031c0ef0ae8605d37e58929387e926214be10aec03e4
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to be a lure, possibly related to academic content, to encourage users to click on malicious links. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8752

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 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
  • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

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

Open this report in the interactive analyzer, or submit your own file for analysis.