Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eac5c223120e95b…

MALICIOUS

PDF

70.8 KB Created: 2020-12-22 19:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1a87642d753f41f9a8d0f70187175b4f SHA-1: e15deaa17826f1bb69cd496ef038fbe2d53fdf30 SHA-256: 0eac5c223120e95b8b2eaeae02d50900f37adcf00138cb6921f0faeb8dda014d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable hosting, and includes a UTM parameter in one URL, indicating a link farm designed to direct traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of a link farm is a strong indicator of malicious activity.

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://traffnew.ru/123?utm_term=dirty+little+secrets PDF link annotation
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/4981386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fc1da622b15f.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/xelipok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fda2d3eb5166.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/036c5e3c5162.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/be739023334.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/e5e5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fdd391cd610986319751208/t/5fdd89022da99c286808ca89/1608354051904/rental_house_rules_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc710ac6879d031da0ff387/t/5fd6ec61ffab5d3c560e71f2/1607920738053/70053185346.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/27130435773.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b633d26ff1194f72bba3/t/5fc1b00961e25426e1775246/1606529034928/engineering_mechanics_statics_14th_edition_solution_manual_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 4256 bytes
SHA-256: 677d895b877e0748773344ae8e88828b6908d3d0a36034e5d302073f5375da78
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10712 bytes
SHA-256: c3458b8fc850ed6750aeb78a9e59fd1c6553779751eb2be74572951a27053db3
font_02_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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