Malicious PDF — malware analysis report

Static analysis result for SHA-256 edeefc770eba01ff…

MALICIOUS

PDF

74.9 KB Created: 2021-03-13 18:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5f3201544359c5ae4e6c6f79228016eb SHA-1: 5691ae5fcfd3ef6b3c15360ffa657f1166a25fd6 SHA-256: edeefc770eba01ff3ac0eae51d8585311ff8da4602d2f2d212b84297745daf4e
224 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document's content, though heavily obfuscated, appears to be a lure related to nutritional information, combined with a heuristic indicating an MFA or one-time-code harvesting lure. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt designed to steal credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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/123?utm_term=nutritional+information+burger+king+veggie+burger In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fd08a6f5e670.pdfIn PDF document text
    • http://justiciaforjustice.com/garadedafy15g4.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/hePjhYd/55914626900.pdfIn PDF document text
    • http://blognews.top/66087144449ypqhq.pdfIn PDF document text
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/mixamotakasi_fufuk.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/social_impact_assessment_process7fjok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6044cebc2e194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_603c4ae913eb2.pdfIn PDF document text
    • http://rasprodavaika.ru/57961380351ucsgz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fdda504e1a34.pdfIn PDF document text
    • https://pegutezupo.weebly.com/uploads/1/3/2/7/132740329/jaxijasi.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/3ghjehg/callaway_gardens_beach_food.pdfIn PDF document text
    • http://o-karte-kopilka.com/67206200819940m.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/buvonujid.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/xufaxoferugod/wotaparojivukewo.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/blitz_brigade_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/abyss_rc_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/epidemiologia_libros.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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 5140 bytes
SHA-256: 3376bee63bc5aa6cb90b9735dfaf861a76249a6f1bac0e942580afaaa74c8a02
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10720 bytes
SHA-256: b669ba6fd81af49319cb1f4ca67b8321f18ad9142ce682f88619d88ce45c597c

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