Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c182483f9a13fe…

MALICIOUS

PDF

48.2 KB Created: 2020-11-07 06:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c36e95d460f4d3c054eedbe97f226ff1 SHA-1: 9494c7cd6bb751cc00a5758466ab9f50eea493a2 SHA-256: 42c182483f9a13fe6ed110e846efcf55102a1161470ec9516c814c511dda4c78
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffi.ru/aws?keyword=beef+tendon+nutritional+value PDF link annotation
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/4541993.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/jufavaxozu_noketopapediv.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/gomewimunol_gulifu_pikaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f9ccb9a40779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f9f7739cb174.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/5980752.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/151752b.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/mefovu/56171720873.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/43282628758.pdfIn PDF document text
    • https://jisejupun.files.wordpress.com/2020/11/zakijiko.pdfIn PDF document text
    • https://gumomonixita.files.wordpress.com/2020/11/81345160285.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://nexupukoj.files.wordpress.com/2020/11/56794901178.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_off00006945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6945 5616 bytes
SHA-256: 88ed6d0e235c16dd05e75e8acbc80c198ae17a533742eabb1a04266d6699fd8c
font_01_sfnt_off00007cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC4 4832 bytes
SHA-256: 20e54ba238d779195d29d38e65e11eb292544d1636b756f5fe5f1b1f441ea36d
font_02_sfnt_off00008d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4C 11532 bytes
SHA-256: 9309075547f911010addc375cf0c2d7302124334841dbfc6d692647869d5cecc

Open this report in the interactive analyzer, or submit your own file for analysis.