Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13c7b92b2d32b1e…

MALICIOUS

PDF

79.8 KB Created: 2021-01-13 20:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 317eabf03585b53cf66ba8a2d066f9fd SHA-1: 73cf1771df9daec86a2d8bcba2dc0107f6172915 SHA-256: d13c7b92b2d32b1e32b3bfac82a144d67357e7807a932fe6cae744f6a41267b9
244 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 websites, many of which are hosted on disposable domains or known redirectors. This behavior is indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://cctraff.ru/123?utm_term=where+is+labradorite+found+in+canada In PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/ronosadirikepasubo.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/wupuzonuwurimibe.pdfIn PDF document text
    • https://site-1244201.mozfiles.com/files/1244201/xulujoweluvi.pdfIn PDF document text
    • https://site-1206985.mozfiles.com/files/1206985/94120076868.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/pesovoxegelafa_garavikefijofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5febf929aecaa.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/9112494.pdfIn PDF document text
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/1920319.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/collagenase_ointment_davis.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/tobetatijovopimamuw.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/1964465.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/1226794.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/20198d2a2440fb0.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/clicker_fred_apk_mod.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/8813694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 5260 bytes
SHA-256: e0c6636a601cf0e1a3363c79746e717d913cec533083bb1ac4160e65299f52af
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 10924 bytes
SHA-256: 0158cc6bcbd1e8bc4c568a03177a3f21d4310c0df59186a1e34f9e0499951201
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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