Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3259c5c17fca88…

MALICIOUS

PDF

86.2 KB Created: 2021-02-16 02:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16311fdfb913c5dfdb04f8bec5ee3fe3 SHA-1: cf1f0cbf30e477bcee5d7e3f72457a70e0faeffe SHA-256: ad3259c5c17fca883f062f9e94e256b719289fd599ce68cb6134e7c7e2b41dba
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow, potentially involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=lab+manual+for+chemistry+class+12 PDF link annotation
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/naxefosowavirul.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/kvidhas/fast_food_cooking_games_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6014068cc0f57.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/DgdPlB1/woxebewarenadonobubu.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/WJsjhij/devukimolukepugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fe9709414065.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/jorilemumuxoxep.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/cf48d07f4fbd7e.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/geNjdib/amcas_gpa_calculator_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/gibhdib/68065813908.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/d02b0acf3535c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64bb7324ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fdb286527273.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/vutoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sakaburepagase/35284963776.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5368 bytes
SHA-256: ff53e68c8017ab4ab96c48f932bb30aacc5ea0bd2842b2ceddfd917a1e68fb2c
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 2596 bytes
SHA-256: f5d044815b995fb36441b6aff9d45060d69c26351301376774b6a1e7054523d2
font_02_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10636 bytes
SHA-256: 974f61195f93228b1a7ca48e5b24da52771ac6aa0c4ef0a3186c461050ef9580
font_03_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16352 bytes
SHA-256: 9cb0650af5bdb2e8593988a361a40fe1030b61ea25d8fce7fab67310e0b1f9a7
font_04_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34