Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2c81b3a64c29c7…

MALICIOUS

PDF

78.1 KB Created: 2021-05-18 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 32dc71f82a30eeacdaadecd9eb88bf80 SHA-1: df49e99050a276a32837934effbb6913c9f3bd5d SHA-256: 4f2c81b3a64c29c7eecc09e231b3a66e23ae0442daf64b0b3ae488bd948e28b1
194 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it links to known malicious redirector infrastructure, specifically identified as a phishing lure. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL 'https://crophysi.ru/strik?utm_term=full+focus+planner+review' is the primary indicator of a phishing attempt, disguised under the guise of a 'Full focus planner review'. No scripts were extracted, but the PDF structure and linked URL are sufficient to classify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=full+focus+planner+review In PDF document text
    • http://fuzirirofo.iblogger.org/xiwabiwusugaruwasujezef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_602880951d5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_605d8d8c0fa59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6049a7c294336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fce2bbcaec8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuwewime.rf.gd/64562752988.pdfIn PDF document text
    • http://konuruxad.rf.gd/rekubavudetito.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/41396817382.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/jonilexovavowezaga.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/makita_chainsaw_chain_guide.pdfIn PDF document text
    • http://pefegazafil.epizy.com/51971966075.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/aspiration_pneumonia_review.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/canon_canoscan_lide_220_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/tencent_gaming_buddy_64_bit_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/bitawunex.pdfIn PDF document text
    • http://zumoriko.epizy.com/shear_force_and_bending_moment_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/61847949179.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/choo_choo_maari_video_song.pdfIn PDF document text
    • http://putusalop.epizy.com/voltage_stabilizer_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/download_film_fifty_shades_of_darker_2017_subtitle_indonesia_lk21.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/2019_calendar_philippines_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/fishing_reports_long_island.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/nafajetad.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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5116 bytes
SHA-256: 76420af9c94de34d9fe53bc385253fd56b44a38193362cacd6f89debec658dcb
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 11220 bytes
SHA-256: 77f56c99cfa4d9bffadbf568ac76615b15015c513a395b4a191ac3a18ae1a888