Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709fd3692411590…

MALICIOUS

PDF

69.7 KB Created: 2021-03-15 20:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bccfea1042380bfb84e7e31c75a57dda SHA-1: b33c12b58b1eb364357f014d1b91c2d7c1c7c767 SHA-256: 2709fd36924115901005af1b1e099f3ffedb20462b6e23f6a39a93f665c385bd
204 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector and a link farm, with one URL pointing to known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to an application form, consistent with phishing or malware distribution tactics. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/award?keyword=rya+book+bank+application+form+2020+pdf In PDF document text
    • https://cdn.sqhk.co/felebamifuk/rFhcpA7/magic_tiles_3_apk_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/P78hcqr/rcc_real_car_crash_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/ihddhez/tolusozutugole.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/56887244767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozurusezop.rf.gd/katodogevulofiresova.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/26421574089.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/zinukotojifukukovoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/tuburab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fdb0bd-8b7c-4958-b235-8079c2b8d201/arris_nvg589_firmware_att.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/xidatano.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/free_powerpoint_flowchart_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/zokinamaderugasa.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_65a4eac5294945fd957a8b7cb0f35944.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_942a52ce4d704929a25df2e9b1e3c89c.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_1ce88e84895442239bb296977c781d12.pdf?index=trueIn PDF document text
    • http://bonizeza.epizy.com/38600334424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b396f38-2db8-4ef3-a1d1-ebd71b57789e/panuribo.pdfIn PDF document text
    • http://mipovigubebi.rf.gd/barber_shop_game_apk.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_822c3ece7f08446fa89193ac7132d6ca.pdf?index=trueIn 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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 5708 bytes
SHA-256: 7a618dbc8fc0b21df3daf1142cdc1b428ce908327235a7b37bff28017e530bc5
font_01_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 11264 bytes
SHA-256: 41bac6dec05ea5deeae5bcfca68e5555dca7b25164798bff2345526596ee4ab5

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