Malicious PDF — malware analysis report

Static analysis result for SHA-256 83657bd7410822a4…

MALICIOUS

PDF

75.0 KB Created: 2021-02-17 03:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e6ab88715b1a32e336af9e26c11e0027 SHA-1: 73c09a80b6bd366cd327e50e17ba91f0fec78c1b SHA-256: 83657bd7410822a49bb6d52c0522e4064843e72e8da7ef8ba52cd1d636d8e053
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to reference a "Butterball oil free electric turkey fryer manual", likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=butterball+oil+free+electric+turkey+fryer+manual In PDF document text
    • http://keepxufi.space/ketefotenewerijafukevevukb8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6019cb3171172.pdfIn PDF document text
    • http://natur-green.fun/851275293340dgn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600a058b52b71.pdfIn PDF document text
    • http://all-gopro.com/nsw_fire_report_applicationrk1sr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fd7d3fb52ca2.pdfIn PDF document text
    • http://openchambre.xyz/oster_express_bread_maker_manual5nz7r.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/wajufifenoxuj/cfop_cross.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/aptis_exam_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/molurowabepelijita.pdfIn PDF document text
    • http://xeregolipota.epizy.com/bixelu.pdfIn PDF document text
    • http://roxeruteruda.epizy.com/63793781812.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/pepomomapegefol.pdfIn PDF document text
    • http://rekobitofaro.epizy.com/is_casino_niagara_open_now.pdfIn PDF document text
    • http://tuwemajufa.rf.gd/android_root_software_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/56700178666.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/parametrik_ve_parametrik_olmayan_testler.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/lapigenajaxese.pdfIn PDF document text
    • http://luxogigir.rf.gd/transitive_and_intransitive_verbs_worksheet_class_7.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/msc_business_informatics_mannheim.pdfIn PDF document text
    • http://wivifizurata.epizy.com/cbi_shankar_kannada_movie_video_songs.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_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5204 bytes
SHA-256: bd5f063f97ba79b6bca6431b8d7d4c988ec5f1f6686827c871653c664a721e11
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 9824 bytes
SHA-256: efc19523c814bfc0510fb573eeeb05a555f80549db5230103aca791138eff083

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