Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1da66c89cae4f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 08:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b0815e9594ab3a5041454f2481aca77 SHA-1: c4496a6998ea096181d75ca6330ad68b62adaaba SHA-256: baf1da66c89cae4f8b37295fef3d2c4f8f7f342cf22d3fc4759cb893258cab4e
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to funnel users to malicious sites. While no scripts were directly extracted, the nature of the embedded links and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://dafemum.ru/award?keyword=coupled+cfd+dem+modeling+pdf In PDF document text
    • http://bimoriz.getenjoyment.net/34663531588.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/rotidunekefaxadarira.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/pezuvizibij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffe9c178aa14.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489061/normal_600016de5e1a3.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/jh4jaiw/traditional_japanese_sword_makers_in_japan.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/gisuziwaji-gisujeve-fukozumotewakis-vigurewududox.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/eeii791/laser_overload_build.pdfIn PDF document text
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/7858598.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/995bb704b.pdfIn PDF document text
    • http://tuxosuzarug.iblogger.org/record_player_scratch_sound_effect_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jadupapobixe.epizy.com/what_makes_a_good_common_app_essay.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/2014_taotao_110cc_atv_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae840641-63a4-4fbf-b558-647bdea017f8/73201962228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61144f46-ce21-4b41-a83e-b5c2648f4f64/wadotijafukikeb.pdfIn PDF document text
    • http://nenujogi.rf.gd/958608561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0292af-23f5-4251-bac2-5b59ae74f3d9/34392869645.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/13705112340.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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 4896 bytes
SHA-256: fa4227e70ecfaba67e5a6a6464d0b2ffd08307f174396b65402f07d56e5c3bb4
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 10948 bytes
SHA-256: 55b6595ab6cb5b0bcbf5f55e140f1dc79e1624b9920db0db69bbb0fec12e8fc1
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16088 bytes
SHA-256: 9900a2061f4db6d5851a1fb623229e1c91a1f2215fec638d1e55d9f0c32ecb7f