Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fb5b6bd1f5550a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 13:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c63f0728176f57d767872d18642fcf2a SHA-1: 04c48eb463f430731627f2ab070b324c8f0a21b5 SHA-256: 36fb5b6bd1f5550a7ded449f0604fc1ad1f22a93d9d3073297272491e03ec2da
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF as malicious, and ClamAV detected it as a phishing trojan. The presence of a 'download button' heuristic further supports a phishing or malicious download lure. While no scripts were explicitly extracted, the PDF structure and URL analysis indicate a likely attempt to redirect the user to a malicious site, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=horizontal+recyclerview+in+android+example In PDF document text
    • http://heliusdesign.ru/google_earnings_report_q2_2018y9cjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_600193b521545.pdfIn PDF document text
    • http://hangzhoumetal.ru/41265460175nzbo6.pdfIn PDF document text
    • http://livecopyrightverification.com/car_wash_incident_report_formyv1fd.pdfIn PDF document text
    • http://zorovot.22web.org/what_reading_level_should_a_7th_grader_be_at.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455185/normal_5fe15b9808ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fe5084178d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_604adc6e1f577.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/aao_raja_video_song_tinyjuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubuxosivukip.epizy.com/jasusisutefesukoriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3daa573e-6fec-4616-8c55-6292e632960e/kesupifatesewog.pdfIn PDF document text
    • http://vorafudozef.rf.gd/o_malhadinhas_aquilino_ribeiro.pdfIn PDF document text
    • http://fodixox.rf.gd/25414170154.pdfIn PDF document text
    • http://pidejekakej.epizy.com/zoxifipiwefibepakubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb70daf-2c79-46ce-a5dd-72d433b0f205/fallout_4_settlement_map_locations.pdfIn PDF document text
    • http://fafegeki.rf.gd/singer_esteem_ii_power_cord.pdfIn PDF document text
    • http://fapisab.rf.gd/26992404368.pdfIn PDF document text
    • http://dumatefofexulen.epizy.com/70993139735.pdfIn PDF document text
    • http://dewutawezidu.rf.gd/fapokeripazisiveduwiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb2b86-1da3-4960-9d42-debda2d833c0/swimming_to_lose_weight_mens_health.pdfIn PDF document text
    • http://nifogegaf.epizy.com/verumerineg.pdfIn PDF document text
    • http://rakumutebita.epizy.com/durivimopidotedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebfc6b95-7e17-484a-8c83-5719c9f63a5b/8971627169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51676441-02f5-49dc-bfc5-6a26f46ee4e0/what_does_hanegraaff_mean_by_forbidden_knowledge.pdfIn PDF document text
    • http://pewafup.epizy.com/57595270394.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5376 bytes
SHA-256: fe2935c70abf5bb3588c22831f17697a598abadfb9230d6821a24d157a46a1b5
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 12172 bytes
SHA-256: 91cc24b30651c850776ee1fb722f49e0f944ccb8652b390d5eb3be9a2a7a9f5f

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