Malicious PDF — malware analysis report

Static analysis result for SHA-256 59893425df121148…

MALICIOUS

PDF

46.1 KB Created: 2020-11-09 05:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 075f8d0700e0b59969c741a01c2bf024 SHA-1: 474c2bc3339edaba6bd154c70ee42615f0fde43e SHA-256: 59893425df121148b3635babc97b26284a7401a319361d6940ff2345f1b44cd9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various external PDF files, many of which are hosted on disposable or suspicious domains. One link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to 'worksheet answers' and a URL, suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffmen.ru/123?keyword=night+book+worksheet+answers In PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/2e5789.pdfIn PDF document text
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/punud-zatikaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fa01c17a62d8.pdfIn PDF document text
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/nelexowabepi.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/sejivepigogetu_fefab_dotarenezona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f8efc936a36f.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/d2fa1f5e-72b5-491a-b91f-03d584c5f7f9/35686374696.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/bivanigezevilitonumegem.pdfIn PDF document text
    • https://nodumizid.files.wordpress.com/2020/11/71668234050.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/ush_sensor_driver.pdfIn PDF document text
    • https://jirovef.files.wordpress.com/2020/11/sodur.pdfIn PDF document text
    • https://sitedok.files.wordpress.com/2020/11/watch_ghost_protocol_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/24067180270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf32554-dc41-472b-baf2-1ef0cfc47503/zojizapafoxitiletigo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 5180 bytes
SHA-256: 879acf08f6eaff87d10f624d3ee035908da988200f9ecd27945d501ac784db7b
font_01_sfnt_off00007306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 10308 bytes
SHA-256: b07a7f06e576de0711b87bfe7b0d84323c3b7fe4de8dfd790d0ceffd0878cced
font_02_sfnt_off0000969d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x969D 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d

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