Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd090f721b249bac…

MALICIOUS

PDF

81.4 KB Created: 2021-01-08 05:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0db3e1cafa2084d852b6511ce6a3aca2 SHA-1: dca708ab7e35e72071e71db81093adfde64bcc04 SHA-256: cd090f721b249bace431d9ea377d7439f5ed1353fe3ff83535fd66048467e4fa
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs, such as https://ggtraff.ru/123?utm_term=mrs+daws+digital+classroom, are likely used to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=mrs+daws+digital+classroom In PDF document text
    • https://dugixezixek.weebly.com/uploads/1/3/4/3/134344389/fc7e214cef3.pdfIn PDF document text
    • https://rujenamifib.weebly.com/uploads/1/3/4/6/134652207/matirat.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/b2351c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fe6665f69088.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/zobexema.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/kefowabaxe.pdfIn PDF document text
    • https://lulapusorifat.weebly.com/uploads/1/3/1/4/131436971/2696465.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/igggif0/tomah_wisconsin_tractor_pull_2020.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/7703049.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/rizezobabub/77209323797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4546d077-eb5a-48ac-8316-d2cd01909354/kaxuratanuvoripukisup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bab31e4-6f4a-4340-b512-1ccf2211a0da/namorepiweluze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea3e40c-5ec5-44cf-9728-3f6c1d48d479/a_book_in_every_home.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_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 5356 bytes
SHA-256: 75125134298aad0b5a3246e493cab5077219f03219e08fcd14fdbbc4a58d150a
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 10896 bytes
SHA-256: cff7d66dc6d66735a2133482ae33e56ab4c51ef1d3a4543c7a884cf01d39be72

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