Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7de01c86cdef7a8…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 11:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6ffc0c14ec5845aa04552d9389fe9e33 SHA-1: 5780d8f8328d03433d8cd0a10ead4b0f22c5d89c SHA-256: c7de01c86cdef7a86234126ea636fcf438b6cbe60686b8e9d289a5475b4562fe
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading software. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

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
  • 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.
  • 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://druttle.ru/wix?keyword=asphalt+8+mod+apk+latest+version+free+download+for+android PDF link annotation
    • http://igbusinessabouthelp.com/lavavajillas_ariston_ll64_manual33afv.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/arduino_leonardo_driver_windows_8.pdfIn PDF document text
    • http://gonzo-3d.com/what_were_the_main_economic_motives_for_western_imperialism05kh7.pdfIn PDF document text
    • http://lapebev.iblogger.org/black_templates_for_powerpoint_presentation.pdfIn PDF document text
    • http://znohist.site/brihaspati_dev_ki_aarti9ka9b.pdfIn PDF document text
    • http://wavikedinufefe.iblogger.org/chiari_ii_malformation_definition.pdfIn PDF document text
    • http://fiwojinafo.22web.org/34164288072.pdfIn PDF document text
    • http://7lessons.site/can_i_use_regular_flour_in_bread_makereu1i4.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/17238917058.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/linear_algebra_with_applications_ninth_edition_solutions.pdfIn PDF document text
    • http://lerob.info/secondhand_lions_full_movie_free85pff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_3def932fe6b445e49d352153039664cb.pdf?index=trueIn PDF document text
    • http://bujewotaf.rf.gd/57196331150.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/benikuzesusaxuninixav.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/arduino_print_string_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/free_act_math_practice_test_with_answers.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_f70249c542ad4fee80c50d0f43579038.pdf?index=trueIn 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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 5680 bytes
SHA-256: 7329ad195f5b602d27b84440ee1f309574e673d3c0c9539e2f67653b87aa518e
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 11256 bytes
SHA-256: 220f2404695a6a1184ff7c3fed5625e1a9546ab12b02d8c0ff1572c4ff7c6f97

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