Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b1b8b9cbc4d6c4…

MALICIOUS

PDF

65.4 KB Created: 2021-02-15 10:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 70faae80c69fcf12051f729c532aff73 SHA-1: bb4d46abd78d15bd16fb71feb03471e3fd0ab6b8 SHA-256: 93b1b8b9cbc4d6c420b66c6f85b23b6c28c632ef9eee0dc8afcf5b41f459c604
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Retro fitness fair lawn nj hours', aiming to trick users into visiting the malicious link. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or credential harvesting attempt.

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://maypoin.ru/123?utm_term=retro+fitness+fair+lawn+nj+hours PDF link annotation
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/8f7ef04083c5c.pdfIn PDF document text
    • http://stroy-level.ru/ncert_books_full_formp9f01.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/3748371.pdfIn PDF document text
    • http://steblin.pro/xuwuwezekeropokiyixq4.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/tetevixu.pdfIn PDF document text
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/2000599.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/bapuwijijatezigo.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/430590.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/aa3e4d5f965.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/megodipewukitoj/xonaxufokezunetisizab.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/question_answer_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/browser_terbaik_untuk_hp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/lujemorovabakuja.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_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 5032 bytes
SHA-256: 5eff6c2b0d0085c36d7c94aa5fe8efbba390ec36df6e87ce40f5bcb8be230e4b
font_01_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 10172 bytes
SHA-256: 01c2c87e9434f37e5ee98a7f40f59a07e0df0c1c38c13764290e284eea71a0ce

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