Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ef62d912e612db…

MALICIOUS

PDF

69.5 KB Created: 2021-02-24 08:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eacf74a353a7293d3bd38e94adb17424 SHA-1: 996fec097dc2402c5ceb2390a071dcf1130b54e3 SHA-256: d5ef62d912e612dba7be9f16777c2931565012b9550a25fcced7adcab464d78f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/wix?keyword=2x+%252B+15+answer PDF link annotation
    • http://storezone.info/que_es_un_objeto_de_aprendizaje373vt.pdfIn PDF document text
    • http://znatural.space/xuxubizanuro1bq27.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/vobipifatek.pdfIn PDF document text
    • http://merishwheelrecords.com/beimaan_piya_re_dj_songaf84e.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/iTidha3/i_don_t_know_song_lyrics_tik_tok.pdfIn PDF document text
    • https://piminudoligot.weebly.com/uploads/1/3/4/6/134688392/jutuluvefe.pdfIn PDF document text
    • https://supeneti.weebly.com/uploads/1/3/2/8/132815050/rinaxuvetulol.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://kavotipuwevir.epizy.com/english_sentence_structure_rules_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/balafon_sheet_music.pdfIn PDF document text
    • http://vevemaj.rf.gd/dananerodazixize.pdfIn PDF document text
    • http://lofenabowebezuk.epizy.com/first_grade_homework_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/dijakegek.pdfIn PDF document text
    • http://losisotudek.epizy.com/98414669726.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/utorrent_music_albums.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/informal_letter_of_resignation_template.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_off0000c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 4572 bytes
SHA-256: fc07dd7c62a9c9fc1af330745ef9303ed00cbfd7afd4bf504a4d21838959a454
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 11440 bytes
SHA-256: a92357a8e079c786513b5006430dedbd865aed412585f45fe81c85785e8941f0
font_02_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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