Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1f7c22547d2bd…

MALICIOUS

PDF

91.2 KB Created: 2021-02-08 00:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9f6a1385c6134b452aa59ebde44777eb SHA-1: 25c1148ad0ffaac6a1abfd79d696ed7238799d9d SHA-256: 3cf1f7c22547d2bd73ed9baca5cec1f525d9f007611f7005898f9860d0719296
174 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://crophysi.ru/wb?keyword=callan%20method%20book%201%20stage%203%20pdf'. This URL is likely used to deliver a secondary payload or conduct phishing. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/wb?keyword=callan%20method%20book%201%20stage%203%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5fe9416ce58ff.pdfIn PDF document text
    • http://faromobipon.22web.org/tuzepibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fd228123a913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_600b4aa3361f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_60039ce88c15f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5fe4be7678256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fdefbe6728f7.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/lixisoramitavazuz.pdfIn PDF document text
    • http://rimaloxal.22web.org/66089551821.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/vexosafugunu/34856203935.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/xegupitegodinatematenur.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/pufovaviwilubemefike.pdfIn PDF document text
    • http://kozifina.epizy.com/14331781467.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/jobifigozarotoximuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/assignment_of_benefits_medicare_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/ladowepazafinakilipob.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/table_of_contents_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/black_snake_moan_full_movie_hd.pdfIn PDF document text
    • http://jumezezufa.rf.gd/gosivifu.pdfIn PDF document text
    • http://betesemimototi.rf.gd/alliance_football_league_team_uniforms.pdfIn PDF document text
    • http://saziwujezad.epizy.com/92956811387.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000125fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125FE 31272 bytes
SHA-256: cbf94776fa07e60c168bda9b2842040a15a10ea2b512975823e673c64b76107f
font_00_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5684 bytes
SHA-256: 3231a1517742f666ca8671f28d6d038b51898e203e7705d9060fe5a2a7da0bad
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 9684 bytes
SHA-256: 8529b65710f05f22f11465e7a775b14a7474e7ce3ab77ea58df8776a6f747e54

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