Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf03ac51597e4f0a…

MALICIOUS

PDF

85.9 KB Created: 2021-05-19 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b61f37194bac4925bed6e2c494f82a93 SHA-1: af410de808c91dc48bf9eb224208ab2750b91bb8 SHA-256: cf03ac51597e4f0aefbca986f9a8559b28932598a81855c2d884df04edc6779f
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, with a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL `https://crophysi.ru/strik?utm_term=the+golden+thread+esoteric+hitlerism+pdf` is the primary indicator of this malicious activity. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/strik?utm_term=the+golden+thread+esoteric+hitlerism+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fc834e0e770f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_60469b6cac018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_60421c6e9915e.pdfIn PDF document text
    • http://fojenuf.iblogger.org/hiperplasia_prostatica_benigna_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_605b4c2233d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_6035e2c5af313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_60383b4a3b647.pdfIn PDF document text
    • http://bidurevemoj.22web.org/chinese_learning_beginner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_60678a1cec642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_6000340e46209.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/zerepuzuze/juxolitulusuvezurevubof.pdfIn PDF document text
    • http://libebusabej.epizy.com/55499705903.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/quran_arabic_to_english_translation.pdfIn PDF document text
    • http://jigugepolega.epizy.com/gta_san_andreas_cheats_pc_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/sipogidax.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/java_update_171_64_bit.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/machine_learning_c_bn_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/gorepememuzazu.pdfIn PDF document text
    • http://liboditi.rf.gd/45105629412.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/mitukudisiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/whirlpool_washing_machine_reset_button.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/big_data_analysis_darshan.pdfIn PDF document text
    • http://zaramapowo.rf.gd/2020_monthly_calendar_template_word_with_holidays.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_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 5516 bytes
SHA-256: 6d2c2d40149c522dfe5949fe2d094ffbfb06289d24c538ca0a1860a109ddd410
font_01_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 11968 bytes
SHA-256: e5d3ca37185c3543bc115f16b68ad4f63d6ede7b5d4a0c48348d264e85cadb0d

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