Malicious PDF — malware analysis report

Static analysis result for SHA-256 3537ee89efac9131…

MALICIOUS

PDF

111.7 KB Created: 2021-05-24 00:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 183dca961ed66bc410b8eac1b44eb16f SHA-1: 0aaa8aca790d95b3ce318ec74de718f4b93f46cb SHA-256: 3537ee89efac91318354908f504cc11882540269926bfd4496c3f0e738bb4bda
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or SEO manipulation tactic. The primary external URI points to 'zajinet.ru/strik', which is likely a malicious landing page. While no scripts were extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+get+golden+eggs+in+shell+shockers PDF link annotation
    • https://bozexiwagufib.weebly.com/uploads/1/3/4/6/134695017/kutoderisegi-wasilomoben.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/fae111b.pdfIn PDF document text
    • https://bezowaki.weebly.com/uploads/1/3/4/6/134611163/7753715.pdfIn PDF document text
    • https://jitebosezukazup.weebly.com/uploads/1/3/4/1/134131420/a73ebf7473a04e2.pdfIn PDF document text
    • https://wofirifitobad.weebly.com/uploads/1/3/4/3/134310136/9959340.pdfIn PDF document text
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/b7a0786ad27.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/ba4a19f003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xapijifas/shakespeare_sonnet_130_analysis_line_by_line.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/chuck_palahniuk_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/chrome_para_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1414ef89-4591-4dab-a5a5-ea16d972dc71/metodologia_dela_investigacion_sampieri_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dd081d-e7bd-4aef-9610-19566097ccc8/76866465804.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/fokimuje.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/48942188573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c47aef-6ce5-43a0-89eb-c0f4acd01b3a/scud_the_disposable_assassin_jeff.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/zoziwemutigumajul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ac7428-8fd4-4e8c-b774-61cd77565c43/is_defending_jacob_a_series.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/exercices_sur_le_comparatif_et_le_superlatif_en_francais.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/sepsis_guidelines_pediatric.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_off00015eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDA 5108 bytes
SHA-256: 5a82ec80050f6f153830f6b837371c354e13ceb4f804c2fe6cd6d7d406d56aee
font_01_sfnt_off0001704b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704B 12480 bytes
SHA-256: 39c7c0b03d9645909553be7f793bab74f7f1ec5c7a24473ddd675b99023342bd
font_02_sfnt_off000199b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B4 16088 bytes
SHA-256: 67bcfb7c388726f5c3b45134396d4daeb52989b52d679508e6f393a01196499c

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