Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd187bb81c8d7685…

MALICIOUS

PDF

80.2 KB Created: 2021-02-22 07:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bba19af2db780dcf4e3de4ce570e0f90 SHA-1: a39469eb306abb21fe08fa54002530ed9bac8cb2 SHA-256: dd187bb81c8d7685a819ccfd7f5c83ca01f5e6c21260e7242583cce3bb2b23df
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, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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://bologen.ru/wix?keyword=final+cut+express+4+catalina PDF link annotation
    • http://neojust.ru/draw_me_close_sheet_musicxqq4d.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/5745532.pdfIn PDF document text
    • http://tk-time.site/productos_notables_binomios_conjugadoszpbqz.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/366544.pdfIn PDF document text
    • https://ketokaxuvora.weebly.com/uploads/1/3/1/8/131856042/jozalodonolulujuz.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/43f1e6.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/gdMcKgd/zorikebajirujifipuvike.pdfIn PDF document text
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/3e63828be63.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/2da1d22c2e.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/vuxazadezole.pdfIn PDF document text
    • http://startbastar.online/17066102437xlfcd.pdfIn PDF document text
    • http://confirmationhelpcenter.com/babejozeworilepa0211.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/gejazowalov.pdfIn PDF document text
    • http://goldenframecollision.com/how_to_connect_magic_mouse_2_to_ipad_pro_10.5yhwcm.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/fajonubinomeder/appu_movie_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/wedding_reception_timeline_of_events_template.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/lawn_tennis_racket_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/84758851769.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_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 5040 bytes
SHA-256: 58e774343ce1916050e2e46661414e8abe201b5a36d55ceea90d638dfe33b821
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10472 bytes
SHA-256: 9d787b40f3fd259e60427f786bccffacb2448c73a29c4d98a7120dddbb851bc7

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