Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc3cdba920524d8…

MALICIOUS

PDF

74.3 KB Created: 2021-02-26 07:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 22d24131c36893560090c05c94ccbf26 SHA-1: 197fb5e2ae45b63ffe8211710b9dfda6a17f0280 SHA-256: efc3cdba920524d8cbb55dcaad3370df2dc70705bdeb5572e5d6788c3f64d825
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link pointing to 'crophysi.ru', identified by heuristics as a critical threat. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of a malicious URL and the critical heuristic firings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=kenmore+washer+service+center In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5ff05e4b672c4.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/xqdEbih/jabilodazonenezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5fcd3c0764ad8.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/9a59d7e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fef1820833b7.pdfIn PDF document text
    • https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/7361885.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/5_grounding_techniques_for_anxiety.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/ig0hhdG/paint_dropper_powerpoint.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/nopanakakiza.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/BiaeWgh/womuwerex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5fcc5bc7bbf74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_6024f5863ce5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupepiwora.rf.gd/tejavivarodixewat.pdfIn PDF document text
    • http://nidudovuj.epizy.com/koxerenozub.pdfIn PDF document text
    • http://davirokonal.epizy.com/waste_to_energy_conversion_technology.pdfIn PDF document text
    • http://zosugojalomefu.epizy.com/zitunafe.pdfIn PDF document text
    • http://kodireso.epizy.com/bewuvewugex.pdfIn PDF document text
    • http://ravowimeju.epizy.com/watevozejof.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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5128 bytes
SHA-256: ea07d7c10cfd7322f1069dc9ac1acffe5461429e43b0b6befd55ff940a192c1c
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10192 bytes
SHA-256: 49cdf7c724858848659e6d1e54789b0b0f4e48a34f8b3c300104379db160e383

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