Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f8787e30a78168…

MALICIOUS

PDF

70.5 KB Created: 2021-01-25 22:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 075ca63ec8251fcabd5bdd07b70a59bb SHA-1: 910daaf1514c5fa7f5be6e94c227d5ad147a7ba3 SHA-256: 78f8787e30a78168e89e882eb538484b02c08aabc18bf7f3ad36bf40a0ece045
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs likely lead to malicious content or further stages of an attack.

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/wb?keyword=kohl PDF link annotation
    • https://cdn.sqhk.co/rorefevobo/ehjdjcd/wakakuleminezeduloluleg.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/4168974.pdfIn PDF document text
    • http://citimart.online/rakaxatokaninoxisaxegx6hl.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/berliner_platz_3_neu_lehrerhandreichungen.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/idgc46C/indpay_app_user_locked.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/dHI9ij2/board_games_for_adults_at_walmart.pdfIn PDF document text
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/315bb3.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/570Grgj/7475711983.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/vuguxazigafegu.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/iggi9gc/navy_field_day.pdfIn PDF document text
    • https://mapuxotegudu.weebly.com/uploads/1/3/4/3/134356271/dalonikenedezova.pdfIn PDF document text
    • http://francobusiness.com/selugolumopozedutdvy0l.pdfIn PDF document text
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/patewezi_kamena_sanidajuwisasi_juwevon.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/kiviwuv.pdfIn PDF document text
    • http://lamovingcompany.com/peekapoo_breeders_in_georgia7xjlk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofududegotu.epizy.com/stalker_clear_sky_actor._ltx.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/electrolux_air_purifier_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/acronis_backup_and_recovery_11._5_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/abstract_nouns_worksheet_grade_5.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 4820 bytes
SHA-256: eabec1fb332a2c30a2da859825cbd2413e76e1c5eb93e38509c8ccd1f563814b
font_01_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 11160 bytes
SHA-256: 6cf2b3228f83e9dfb4aa4ae76a348728fd69dc3b78ab8d5f2ba97adeca521c15

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