Malicious PDF — malware analysis report

Static analysis result for SHA-256 38442de0352f910a…

MALICIOUS

PDF

80.9 KB Created: 2021-02-20 19:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7d8facadc85e0357be93b1b8982a09a8 SHA-1: 1b49832cf02b64bc107d3de7693055a2cced5b79 SHA-256: 38442de0352f910ace507567b9883f2a3a67ff0c09e3c033676c62b37afe9f53
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'yafferge.ru'. The document body, though heavily obfuscated, suggests a lure related to downloading free trials, aligning with phishing tactics. The presence of multiple links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

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
  • 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/strik?utm_term=how+to+download+apple+music+free+trial In PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/571c183ea9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fce5d163e933.pdfIn PDF document text
    • http://fruit-citrus.space/highway_traffic_act_careless_driving_chargeadx99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe01bdcdf4c8.pdfIn PDF document text
    • http://itayoga.space/11460900189ilerc.pdfIn PDF document text
    • https://jizanisa.weebly.com/uploads/1/3/5/3/135386656/8765551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_5fd9788abce18.pdfIn PDF document text
    • http://ideal-it.fun/pros_and_cons_of_disengagement_theoryh359d.pdfIn PDF document text
    • http://ourfanz.com/482046410833fbmx.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/27Fhjig/tomekagorusiluxomibimita.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/pififugaviwu.pdfIn PDF document text
    • https://fivaxozokudok.weebly.com/uploads/1/3/6/0/136049694/webigirov-xibagafivap-xudemirapi-wetulezi.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/articles_about_human_trafficking_in_the_united_states_2020.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/64367966215t6tnd.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/tiluwisulepam/16608887963.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/30273679427.pdfIn PDF document text
    • http://luselobek.epizy.com/39941539536.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/37889520338.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_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 5356 bytes
SHA-256: 5dd0370a4bf978ab62222e3f3f96f029befdea26ec70ce7eecd8589aabac8d7d
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 11212 bytes
SHA-256: d82ac2c0bbb94c0ec8c22af59804e4d90cf949b646fb51a7e1dffaa6dff42674

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