Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c045a83316fa524…

MALICIOUS

PDF

79.8 KB Created: 2021-04-21 01:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 395a87f412386f0ded45612b8f5c9126 SHA-1: ccff9d32deb2db69053d7e8fc4d4feb86aa86cd4 SHA-256: 1c045a83316fa524451b27103e01d2290103ba7e09596f6973b107f33fd89f3d
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=pilot+english+grammar+10th+class+pdf PDF link annotation
    • http://best-ital.fun/nba_2k20_pc_game_system_requirements7fvdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6023c4786d9c1.pdfIn PDF document text
    • http://cmbclientes.com/50205454215r1uz7.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/hGjaKig/nitimixi.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/hhgcGja/pijurakigukirexopebeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fd092ffaf102.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • http://sedugarawale.22web.org/computer_hardware_definition_and_examples.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/5199099.pdfIn PDF document text
    • http://1eyvgo.xyz/free_wheel_of_life_worksheetrdmfx.pdfIn PDF document text
    • http://gratoramaa.space/59961523246g29qk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6037fd31f07f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_601b53c2e8706.pdfIn PDF document text
    • http://esagafow.fun/how_to_reset_an_hp_printer_to_factory_settingsdcxb4.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/gamotumifedil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5ff3553f89da9.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/BrN8Lhh/screen_recorder_with_audio_game_screen_recorder_app.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://uploads.strikinglycdn.com/files/f3663996-1647-4f0e-990a-6cbeb20c5cc5/sex_offender_probation_rules_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa295b77-f75e-445f-bc58-5b339ff72227/9130782810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a6e9a7-34f7-4a12-afaf-8fc5788a5f84/zixukefunojuvudal.pdfIn PDF document text
    • http://fokozagizek.rf.gd/20232809029.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5552 bytes
SHA-256: 9362425faf86372a1ce682972a4ebae7f889ac31d35e3de2cb39fa4f9abc9969
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10736 bytes
SHA-256: a74bb43d31b1e5fde3e9162073379a502432e8e29d1cf4382640d7a5f2462e78
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e