Malicious PDF — malware analysis report

Static analysis result for SHA-256 15622ec6f92115e6…

MALICIOUS

PDF

69.8 KB Created: 2021-01-19 01:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31af50bac3f3d25b155d0ac5f47c08e3 SHA-1: 375e9871e916551667b4678268f03b32524317f1 SHA-256: 15622ec6f92115e63fdd96ccf353d3f74ff3975a689f5c1d3625d83713118971
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely used as a lure to direct users to potentially harmful websites.

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 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://seumenha.ru/123?utm_term=whs+lions+library PDF link annotation
    • https://cdn.sqhk.co/xenudipu/ifYhfWU/wsdot_traffic_cameras_chehalis.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/jatareloweb.pdfIn PDF document text
    • https://site-1217839.mozfiles.com/files/1217839/depreciation_schedule_excel_template.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/9204483.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/fWjhqOW/13471987413.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/0Jzgjgj/state_farm_bank_merger.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/foFha23/casa_grande_manapakkam_rent.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hehbhjY/why_are_there_cardboard_cutouts_at_baseball_games.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/hjdgiiZ/tezuramikovamej.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hd5JFyM/the_university_of_hong_kong.pdfIn PDF document text
    • https://site-1176253.mozfiles.com/files/1176253/nefesoge.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/zarusegibitumet/jojo_rabbit_parents_guide.pdfIn PDF document text
    • http://jilutuve.rf.gd/alan_wake_gog.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/44171434774.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/14529805453.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/53392785983.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/60086300210.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5028 bytes
SHA-256: 28380b4a4fc50c451df6b300d2d5d522808e47728ab87bcdd24bf81401e3349b
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10820 bytes
SHA-256: a5229e545417ed1465e586c883454c60dee353790a34277adb9be6907fb159b5

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