Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4344d0659307cb0…

MALICIOUS

PDF

100.7 KB Created: 2021-01-23 14:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3ba55ea5b4e59677e612d21a99c10ce7 SHA-1: 142e1548dc33917d75c7cc83b83006264519889c SHA-256: a4344d0659307cb07246b341105e107369dec49accf21d05fd0f27a412d4474d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=a+bomb+marvel+comics'. This indicates the document's primary purpose is to redirect users to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is a high-priority indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/123?utm_term=a+bomb+marvel+comics In PDF document text
    • https://site-1192597.mozfiles.com/files/1192597/android_version_history_2019.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/46005811159.pdfIn PDF document text
    • https://site-1177585.mozfiles.com/files/1177585/sniper_killer_shooter_apk_download.pdfIn PDF document text
    • https://site-1176387.mozfiles.com/files/1176387/61348671890.pdfIn PDF document text
    • https://site-1171458.mozfiles.com/files/1171458/86990859684.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/bf2caf27237b0f3.pdfIn PDF document text
    • https://site-1179801.mozfiles.com/files/1179801/11536361889.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/app_store_updates_slow.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/4562c.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/verifopajola_gasafafaropijal_sosekamemedeb_jetofi.pdfIn PDF document text
    • https://site-1179590.mozfiles.com/files/1179590/almost_home_tv_show_episode_guide.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/93841574012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodireso.epizy.com/ahmedabad_yearly_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/mathematics_10_textbook_answers.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/bpsc_64th_online_form_2018.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/33590483922.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/torobemoririsuvitisi.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/55805170868.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/9300620460.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/ragufugew.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_off00014e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9D 5136 bytes
SHA-256: ace896e420ce223cf12f7bf10390da0e20f0e4f6fb530cd771a589f8edf0a65c
font_01_sfnt_off00015ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFE 11024 bytes
SHA-256: 19f84f825205b90f9ea491081aebbe368d9f30f4cf2346162c16aa321584bc2b

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