Malicious PDF — malware analysis report

Static analysis result for SHA-256 67243129c1e8a208…

MALICIOUS

PDF

87.6 KB Created: 2021-03-19 17:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8bce3d0c2767a7f72d7a219e4b8fa186 SHA-1: d9b80fd740a9c3121e6d5c6d1529f4d004372b70 SHA-256: 67243129c1e8a2089a2148941c9feb4f5fc656e0848ccd030b64f8c708df518d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic indicating an invisible link to a suspicious domain, http://loginwithfb.site/gapapepinibebifuxafuvuliltlfqx.pdf. The document body, though heavily obfuscated, suggests a lure related to 'Gre vocabulary words with pictures pdf'. The presence of numerous links to disposable hosting and link farms further supports a phishing or malicious redirection attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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.
  • 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://mezovuduw.ru/award?keyword=gre+vocabulary+words+with+pictures+pdf PDF link annotation
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/watoj.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/PkD8Qif/vitacost_promo_code_june_2020.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/lelemidoge_goletifitotakot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fdf98e939358.pdfIn PDF document text
    • http://liketsven.xyz/icivics_tribal_government_answer_keyzzv2m.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/hb4IHib/ralph_craft_city_runs.pdfIn PDF document text
    • http://evatopshop.xyz/resume_letterxsspg.pdfIn PDF document text
    • http://loginwithfb.site/gapapepinibebifuxafuvuliltlfqx.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/kijgdt4/praise_and_worship_songs_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5ffbbc5cdc19e.pdfIn PDF document text
    • http://afracheat9.xyz/87640291948pfydz.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/hg9hijc/3178500636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fdbcf46d76c3.pdfIn PDF document text
    • http://agentsecure.space/gnostic_teachingsahyij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60464c6e443bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd8610496317.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/vonusirukete/nusivomagujebokalaji.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/88294103697.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_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 5668 bytes
SHA-256: def85346201b8357f327196e9ff066cf83595a2f31e5c4d5643241a860688300
font_01_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 11664 bytes
SHA-256: 5583c6e4d2a25f894cc8b21529e5afbdf87797eece5c4c727936970ac8c38d96

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