Malicious PDF — malware analysis report

Static analysis result for SHA-256 a558b450d3fde328…

MALICIOUS

PDF

69.8 KB Created: 2021-02-18 09:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 40ceabd08a439656681e07fc7fdb65fe SHA-1: 70fdaaa935ac45465bc6a6cc5a3e3113c2d4a3f5 SHA-256: a558b450d3fde32807f65a42754562035a23a7cac4aac76aa9898fc83b824065
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jacksth.ru', suggesting a redirection to a malicious site. The document's content, though heavily obfuscated, appears to be a lure disguised as an 'ap environmental science final exam study guide'. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=ap+environmental+science+final+exam+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367268/normal_60165857e5139.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/djhKghf/exchange_steam_gift_card_to_bitcoin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5ff9fcff59a7f.pdfIn PDF document text
    • http://ouily.xyz/putefifaxijolowibe7tqrz.pdfIn PDF document text
    • http://zakukat.iblogger.org/angles_in_polygons_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5ff67aeb87865.pdfIn PDF document text
    • http://sputnews.com/24404897355jqfp6.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/icjey6o/bandi_chhor_divas_greetings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_60199205e71e0.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/mamibis/series_llc_operating_agreement_template_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/93591791987.pdfIn PDF document text
    • http://penevebepor.epizy.com/kingdom_come_deliverance_herbalism_guide.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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 5692 bytes
SHA-256: 639810e1a9a6fae698c3a239a5bf97349f332aef0acde0fe8435f6e20c17110c
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10688 bytes
SHA-256: 9feaa817165d3da9cf9bb56f4d3a8fde4b7473db870687e18ecb2c43c86eb57e

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