Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3a9416730f1eb7…

MALICIOUS

PDF

78.3 KB Created: 2021-04-30 04:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 134ad38c17f63eb28fd5b05fb64e69b9 SHA-1: 6abd3c3b6a1434dc5ce3df619a1a12c450eeb742 SHA-256: 1f3a9416730f1eb782b59f9fde37fd3ff4be49c5da1d9036a86a69283fe574e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. One of the primary URLs, 'https://jumiwimov.ru/strik?utm_term=what+is+a+legal+last+will+and+testament', suggests a lure related to legal documents, potentially for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jumiwimov.ru/strik?utm_term=what+is+a+legal+last+will+and+testament PDF link annotation
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/molonokama.pdfIn PDF document text
    • http://lejesuxesegofaf.22web.org/java_8_tutorial_point.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_6030aa777c34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6052ad031e3a2.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/874eb9959c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464870/normal_603bd30fbf947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_605d92dc1365b.pdfIn PDF document text
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/2730420.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/2556109.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/mircea_eliade_el_yoga.pdfIn PDF document text
    • http://xexodejefapupel.iblogger.org/basic_english_grammar_in_marathi.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/25c39df3d7b0.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/gudukupir/43444094262.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/21418291054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb275bd-6b3a-466a-8a2b-afb780731ada/camera_shots_and_angles_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/49413148738.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/how_to_form_phosphoric_anhydride_linkage.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_01ff01b7ff6b45548748171f25325cb4.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_abe0d5d6d035495ca07237070ddd46d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06eba86e-b16a-423e-8a4a-74457ba3a986/what_does_abstinence_mean_in_overeaters_anonymous.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/tofebowuvomotuxifirukop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 5248 bytes
SHA-256: a1914a89161f30e86bc3239811fd6af6bb7b5e6dcc6a6ca10275cfd8c44015b9
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10864 bytes
SHA-256: 5b26de1d4a2977efade4ffec7aeeae266ca727d2a5a3731f243239fda8c8b6fb

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