Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c12ef4a62f4fe02…

MALICIOUS

PDF

72.4 KB Created: 2021-01-18 16:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4ee9603134e8e5ffb6816c1199a25d12 SHA-1: 7a1d7271166ab428f17020f1c73db9900e4fdda2 SHA-256: 7c12ef4a62f4fe02e54e3cd1196014ec68eb96cfa457ee82f4b922e69ab93a6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a free download.

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 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.
  • 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://jottigo.ru/123?utm_term=frank+ocean+blonde+free+album+download+zip PDF link annotation
    • https://site-1206965.mozfiles.com/files/1206965/7521101265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_6003812d500a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fcc3be98e0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f91538635891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5ffcac124c2af.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/66830882416.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/gijajf1/89291824801.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/bhewBDV/army_commando_sniper_secret_mission_shooting_games_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5fe4e7c4ce276.pdfIn PDF document text
    • https://site-1171403.mozfiles.com/files/1171403/wire_calculator_current.pdfIn PDF document text
    • https://site-1191329.mozfiles.com/files/1191329/css_asterisk_performance.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
    • https://s3.amazonaws.com/matogapibelifiv/soul_calibur_6_tier_list_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/kagowukarisisetelolojeni.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/fibatogesubazijifen.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/74720993577.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/83391636091.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/14324007048.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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 5228 bytes
SHA-256: d8d3346ad1d4e1c9b8e569bd248d8a8771ba1ce7da59e94ccc1e81dec37cebc2
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 11976 bytes
SHA-256: dc7c1627747304ebd73ac4811bb3eb909e1c85dbd91ac5021439570c25385cb9
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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