Malicious PDF — malware analysis report

Static analysis result for SHA-256 670d8909a7781d98…

MALICIOUS

PDF

74.2 KB Created: 2021-02-03 02:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bcc14031dfcadb6b162a6c54da8931f1 SHA-1: 9e514d256024ac44eb88937dda873c57b1ff4701 SHA-256: 670d8909a7781d9895068d9719646c3ee9ba21384d5b12351a081def809ac17e
136 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is a lure for free downloads, directing users to an external URL. ClamAV detection confirms this is a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL suggest an attempt to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/123?utm_term=desert+spiny+lizard+diet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388067/normal_600820ffe8aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_601275166116b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5fe1ac923dbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_60001ad5ddb85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_600dde4beed4c.pdfIn PDF document text
    • http://rakuropa.iblogger.org/wifi_authentication_problem_android_solution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcef38da870c.pdfIn PDF document text
    • http://yazansoft.com/download_pokemon_moon_decrypted_citra_utorrentkn7er.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/riginanafagowixafi.pdfIn PDF document text
    • http://betixisu.22web.org/nunuloxepiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481280/normal_5febe11df342f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_600de4d312412.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5feec7fdd4989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodapimogu.rf.gd/radusi.pdfIn PDF document text
    • http://jeloneliva.epizy.com/latest_java_windows_7_64_bit.pdfIn PDF document text
    • http://bideliv.rf.gd/annamalai_university_dde_convocation_form_online.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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5104 bytes
SHA-256: ab3424b7b0ada08a8fc12ab2077254885b69f5a56b477bb74b9ae19d7dc4201b
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 10148 bytes
SHA-256: dd790b63630f460000431b1c919742d4ac32834ed5ac3c1350ace8f3fd5126c6