Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba696361bfcc0aea…

MALICIOUS

PDF

75.7 KB Created: 2021-02-04 04:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be53965f647d9db35b7b38441036db82 SHA-1: 6d59d1fe3ae3fadba9c9fbe0ae40003612dfc796 SHA-256: ba696361bfcc0aeab99e47d81f6fd4aa80570cb7b464ce774ad2e897d08c240e
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to educational worksheets, suggesting a lure to disguise the malicious links. The presence of many links on disposable hosting further supports a phishing or malware distribution scheme.

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
  • 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://yafferge.ru/aws?utm_term=math+long+division+worksheets+4th+grade In PDF document text
    • http://damvglaz2.xyz/car_bluetooth_scanner_obd2_elm327c233j.pdfIn PDF document text
    • http://motivawka.online/nutetedufavufakolikhipy.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/4973aefbae.pdfIn PDF document text
    • http://pro-komp-master.website/durapigagijapizawdwfym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5ff409a184e43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd2546ab943c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5febf8b654032.pdfIn PDF document text
    • http://abreudesigns.com/30277767227weoqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415546/normal_5ffb5be08442b.pdfIn PDF document text
    • https://betivina.weebly.com/uploads/1/3/0/7/130774994/7192946.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/luwixuvepil.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/Bhjjehh/repukiromu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_601a597b31193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 5184 bytes
SHA-256: ac3699e14503149a2a5764a640f97eea9a1ae1ecd6eec1fe9173bce33b3609dd
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10192 bytes
SHA-256: 3ad80f610a0817a144738773d21023cd2781b2b09bc950e24da2f308e4f99d1c
font_02_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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