Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3e17cbb4d4ab25…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 04:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 54b5861c7b7f7967b7fbe7e593a0677f SHA-1: 5b53366230d0b15bb434d874ccce0592d56e7383 SHA-256: aa3e17cbb4d4ab25d1c0921cf5a7163e77f17efbeaf0956d1bccb6f97eff9f5d
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to septic tank PDFs, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=puisard+fosse+septique+pdf PDF link annotation
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/reguteximemezumema.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/sql_query_interview_questions.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/mushroom_farming_in_zimbabwe.pdfIn PDF document text
    • https://zugivosiruboni.weebly.com/uploads/1/3/1/8/131858419/992e53e7ceb07d.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/10549381129.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/xebivojojinaneg-xepozapenijezig-zusasodaporij-forepelafilefij.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/hp_deskjet_6830_printer_driver_download.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/jebiju.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/nunixiges.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/convert_to_word_file_download.pdfIn PDF document text
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/betizisev_gikuguv.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/86697643242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_602c8b3d3fa62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_60372bffe5dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_602ad53e0ae63.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/zen_mind_beginner_s_mind_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiporiri.rf.gd/counterparty_credit_risk_wiley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222383d2-3a23-4721-96c4-0a3f265b9a77/how_does_color_affect_perception_of_taste.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/the_penguin_history_of_latin_america_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8361cbc3-b7f4-4424-a203-eeae21714585/vovar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877af520-5dba-47ce-b77c-6c74ede8a050/85557301432.pdfIn PDF document text
    • http://mejesikuwuvaxax.rf.gd/jewuzatugamod.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5128 bytes
SHA-256: 84ca25ec33ec6d207a0f3321808d6c843359bb16a0c432e5d831456d95f11d09
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 12684 bytes
SHA-256: b446fcc19fff9c3286b57a660df732931d43a5e07766ecb6fe6b9b0f8fa0cb9c

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