Malicious PDF — malware analysis report

Static analysis result for SHA-256 801328c24aa22bfe…

MALICIOUS

PDF

64.3 KB Created: 2020-12-18 21:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b002db1b92f0095adb4f5169c391e53 SHA-1: e7afa02802c0aaf3419acce3a2f8894524427753 SHA-256: 801328c24aa22bfe6e3d9f19fa2b399bc19658b66828a713b67c7e0ab6b18d4e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a ClamAV detection for a phishing trojan. The document contains numerous external URIs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=westwood+regional+high+school+employment
    • https://lomasegikuporot.weebly.com/uploads/1/3/4/8/134846826/665c803dd24.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/ce4d928d92c7.pdf
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/2405109.pdf
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fba81a9f1732.pdf
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/1427156.pdf
    • https://fimagokuzite.weebly.com/uploads/1/3/4/6/134681622/jadebiwu.pdf
    • https://lizuvozirowamu.weebly.com/uploads/1/3/4/7/134719338/vajabananej_namil_padelajavajakol.pdf
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/8569126.pdf
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875b353f838.pdf
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/gisif.pdf
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/15a944c06ead5b5.pdf
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/mubefubadidep-dazinopu-duziw-xavazen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fce1829e5cb4c30585e093d/t/5fd66cacffab5d3c56fbc5ac/1607888044907/citizen_in_the_community_merit_badge_worksheet.pdf
    • https://static1.squarespace.com/static/5fc0ed4f1452f90b7fe57e24/t/5fc11116145a8629dcd6ab7e/1606488356283/pretest_physiology_13th_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc83.bin
6bde7741b95a35536826b9de37e5dcfe429bbda722e55860eb88c8a783b9d2d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 5696 bytes
font_01_sfnt_off0000cfcd.bin
da4a26d8d560245e410d8b0cdf8910aea078b3b8d78330e39f2b72b94655a344
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 10632 bytes