Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4fc0b7dd3b6df5…

MALICIOUS

PDF

71.9 KB Created: 2021-01-10 07:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 63e76b73f4c72049f7a4da8f5eca3f2c SHA-1: 5445a0a35844b9cc57e3b3a21e702e69004bd47d SHA-256: 2e4fc0b7dd3b6df561af3802d18cfde24c85cf7e43f619f441ac7508f054604c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the PDF is designed to lead users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=hotel+company+profile+example+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5ff55324eff21.pdfIn PDF document text
    • https://site-1173627.mozfiles.com/files/1173627/counter_strike_black_ops_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459035/normal_5ff3bef4998c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f8b988ed4f68.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/jfSPZ2s/mechanics_bank_mansfield_ohio_cd_rates.pdfIn PDF document text
    • https://site-1213673.mozfiles.com/files/1213673/mod_maker_for_minecraft_education_edition.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/a85218f65317de1.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/fukezavazuj/support_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/narasimha_naidu_songs_come.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/dungeon_crawl_stone_soup_enchanter_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/69394559373.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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 5256 bytes
SHA-256: da69f17cbb2fece9dd0e74557af57c302743496829733f8d26e8d224a6117af8
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10644 bytes
SHA-256: c2d401b8dad8f6c27620f8c7f404d5dccc4408c49cc955c013fc8f24008e273d

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