Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b132385509a810…

MALICIOUS

PDF

70.3 KB Created: 2021-02-15 08:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d6ef7583b94aa2ea2b47ef34632de67b SHA-1: 756e5bb783e0a707a70c040410be007993bd4a9c SHA-256: f1b132385509a810ac5d87e9b085a778ed80ab4d4554fa195ec3e952f600d513
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/wb?keyword=cantilever%20coping%20foam%20forms PDF link annotation
    • http://groby-ritual.online/lastpass_not_autofilling_androidzw0a8.pdfIn PDF document text
    • http://logmeinnow.xyz/gibimarakegyfx5.pdfIn PDF document text
    • http://bonus332.site/945542231472gnhj.pdfIn PDF document text
    • https://lojamagimom.weebly.com/uploads/1/3/0/9/130969840/9601341.pdfIn PDF document text
    • http://reetodo.online/noguwosabowhk5b.pdfIn PDF document text
    • http://1offpark.xyz/dungeon_defenders_3_release_dateftucb.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/gisupominimide_tazuduvi_fosajojuvodag.pdfIn PDF document text
    • http://lnstagram-support.live/dnd_5e_aasimar_guidevecuw.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/lofefi_suwivixalu.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/wupiwupiwot/vekujivoxarujitejazag.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/poe_flask_crafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/koxewenanizivubixibuto.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/the_ridiculous_6_hd_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/32945618594.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/julexazidawoneleziw.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/google_sheets_merge_cells_greyed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/33035209552.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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 5300 bytes
SHA-256: b169c9a978fa6bb80810ee393c54507a68ad6b5baab963dbe295679ce19c1035
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 11112 bytes
SHA-256: 872a080ced6680d9754c9d53c2b6938a4258fb54c9cf2c742e9cfe256d66e0f8

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