Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c1e886bb8623d…

MALICIOUS

PDF

71.8 KB Created: 2020-11-30 10:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 489670cf0961cdea78b0e03f352c2088 SHA-1: 6c82b3289d4435b0906ca6d86b70be196b8fb27d SHA-256: f81c1e886bb8623db2c93166445e30831b983afef511fe0a1bcb0e8c3d972996
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The presence of a malicious redirector URL suggests an attempt to lure users to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=will+ps3+games+work+on+ps4 In PDF document text
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/garagoweketugopatof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7fbe9fc3622d5227cd2/t/5fc1b377145a8629dcf07ea9/1606529912182/caelynn_and_dean_moments.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0f71edabee7b4409d9d4/1606225778388/murawawajitumavir.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/atchison_denman_court_reporting_services_limited.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/kedilowu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd12daeedf074882611d09/1606226651014/hughes_middle_school_dress_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc26ad9cb3e0f57719e297e/1606576865178/daniel_handler_favorite_books.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/acoustic_research_wireless_speakers_instruction_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d96ebd14ff0dd29c6608/t/5fc377a7f8cdb769c64fa885/1606645672584/recognition_proteins_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/koremagevakedogalaji.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc296788787e8798976c150/t/5fc3a1ba08845d0924f9181d/1606656443668/rii_wireless_keyboard_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/vubejubadumekimesafosati.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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 5560 bytes
SHA-256: 01ab0de610224f447b82a22b45f80b76d152ca47dce0c2bf8151bfff27393d1a
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 11132 bytes
SHA-256: fb1a1d72af88bdd19da37af98a7de2f8edc0498385accf8547de2d3ce97cdc6e

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