Malicious PDF — malware analysis report

Static analysis result for SHA-256 4293f62cd97f09b1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 22:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c9ab34bf53a1f77c28d2f0aa150e5f81 SHA-1: 55f7a47b1b1056a11a7fdc3e71b1321937801eff SHA-256: 4293f62cd97f09b1829b34e6aac374917904bb2fbbd79d232bfd4ed7769646c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal the document acts as a link farm, directing users to multiple PDF files hosted on disposable domains, some of which are associated with phishing lures. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=apply+watermark+to+pdf+document PDF link annotation
    • http://mon-compte-cmb.best/jogunodenozurafacr9xk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ffd62e38f919.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/li5hehb/kidoduzuw.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/marathi_barakhadi_writing_practice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_601af5a0ad6bf.pdfIn PDF document text
    • http://dalkomis.website/spoken_english_course_appxhbws.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/djdN3dz/1_clue_words_and_syllables_level_10.pdfIn PDF document text
    • http://itwow.info/bashan_quad_200cc21xdo.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/20055031583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_602ffa634de23.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/48226805944rpjpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_602f996b21b12.pdfIn PDF document text
    • http://teleporttur.ru/aristotle_metaphysics_summary_shmoopxxpsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6016166077778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5fd9de409202d.pdfIn PDF document text
    • http://getdouche.xyz/what_is_an_ice_crystals_form_based_on49wbc.pdfIn PDF document text
    • http://cleaner-inn.club/junipurobodiwamut49qv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fc63aa89e7f9.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/ij3Wjhn/febalegiguzodojor.pdfIn PDF document text
    • http://uptodate.site/varemewamafevogoeb0n6.pdfIn PDF document text
    • https://cdn.sqhk.co/navolakolire/dsZUyje/sazovusizudusadola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_60621c48a9c94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5368 bytes
SHA-256: 62aee5f5dfdcbf0cc4739997317fa1eaeb7f49163c14b5d95974fc9a435756fc
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10480 bytes
SHA-256: 303b95fc9cdd6e0eb29837aa10eb839dda700301e8714bd8d9f1580da11b2b70

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