Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49f4e8aabe25456…

MALICIOUS

PDF

75.5 KB Created: 2020-11-24 04:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ee7602df51e684edafe658a294bff04 SHA-1: 1d39e0eb5e17edbe6c8ce333a6247621f88a3be3 SHA-256: b49f4e8aabe25456f5b1c6550a48900ebbabde5e2c525d4d04629767c3480fb6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. It also exhibits a PDF SEO link farm behavior, with numerous links to external PDFs, including one hosted on 'weebly.com'. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=castle+on+the+hill+ed+sheeran+chords In PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/poniwigugupijena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5fa51834e5660.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/ccacb9acadd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_5fb775520a208.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/vuxam_sumobabut.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/gaziga.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://s3.amazonaws.com/felasorarabipis/gifesegeg.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/xitijugaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21cf001-4b75-4895-8829-97effb47e170/hulu_live_tv_app_for_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/net_framework_4._5_2_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7837078c-f907-43d8-86da-555265591d0b/tiwusemul.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/radical_constructivism.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/99607291760.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 4836 bytes
SHA-256: 5061f0ba86b45e0d2f06aa3e4ac90e48eedbf22ba5d06838299f1915af1a7c2c
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 12528 bytes
SHA-256: 3e124bf93062f13ef259372837063fcf296d226a286beca4c3c076b772a52ef7
font_02_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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