Malicious PDF — malware analysis report

Static analysis result for SHA-256 905a0e4a59383d49…

MALICIOUS

PDF

76.9 KB Created: 2021-05-15 20:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2c5a5ebc86abe85a46ce9b2cad7ff141 SHA-1: 915c6252a84a2f7e71a54d49d3d797c421cb900a SHA-256: 905a0e4a59383d495c3cde8d88a724733a1a1204e265a44b70e01d8fb4600964
184 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'USPS Express Mail'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+usps+express+mail In PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/xavejuwukuzo-limeminesin.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/4219045.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/jarigosulaxas-laluberebiwi-wisevikixuriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_606886c351c3e.pdfIn PDF document text
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/japix.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/1176754.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/451a6c2c835.pdfIn PDF document text
    • http://kedisuli.iblogger.org/star_trek_beyond_jaylah_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60219d3c82780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6012658599bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5ff4dba385fe7.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/server_aruba_mail_android.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/jenagubadopi/fb_login_issue_report.pdfIn PDF document text
    • http://ponuruv.rf.gd/video_cutter_apk_app_free.pdfIn PDF document text
    • http://tilixufevoj.epizy.com/marketing_cv_template_free.pdfIn PDF document text
    • http://litaxuroba.rf.gd/isengard_theme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/42684629496.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/12698208992.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/harry_potter_and_the_sorcerers_stone_minalima_edition_review.pdfIn PDF document text
    • http://gigivixegaxun.epizy.com/yooka_laylee_impossible_lair_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/nelejogixoba.pdfIn PDF document text
    • http://molulig.epizy.com/wonipuxogitopusakoditoku.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_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 5140 bytes
SHA-256: 6b9a5ef8552883b830777095ac3d89a9cc8aa51f04462c163a79d8214d6c1420
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 10712 bytes
SHA-256: 7b141e7238675c72760e707d9f053e049da7c72a62bbdbf893901515b6be48b1

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