Malicious PDF — malware analysis report

Static analysis result for SHA-256 554bbc400815bdfe…

MALICIOUS

PDF

74.0 KB Created: 2021-02-11 16:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 94a5fda3e297901c23d177e45247101f SHA-1: 987b7bcfde7c907d33afd17e5a6770a85334c873 SHA-256: 554bbc400815bdfec9f1148ebbab8fd098b8c4d4dd26dc36a6c1bf15b756a7bd
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=ap+gilder+lehrman+period+6 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_6004503693a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_60079ac836a6e.pdfIn PDF document text
    • http://all-system7.xyz/30701643762ni5um.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5ffe559e66f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_600016a217eff.pdfIn PDF document text
    • http://znakomstva18x.site/mapafosefukj673y.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/vawivivorexogap.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/sidemaxuxifi.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/hbdCgd4/burger_king_near_me_hours_today.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/momekomelugiresipe.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/tudavogul.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/gcjb5ij/ac_odyssey_judgement_of_atlantis_walkthrough.pdfIn PDF document text
    • http://letnesil.xyz/lezexakuxafevepavofobutigbjfs9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bageradafasuk.rf.gd/bull_horn_sound_check.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/70099589275.pdfIn PDF document text
    • http://puwegobatove.epizy.com/vafowudu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 5048 bytes
SHA-256: 9118c946526a249686d970998f728cd42cce90689bec7c8cadfa98b74f1ec064
font_01_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 15056 bytes
SHA-256: 7f938a5237ff458eb57e7d44d4e98cbc237437c24bc095d2ca9e7da871fb1ee0
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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