Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3fcbb9d1ed7ee5…

MALICIOUS

PDF

91.0 KB Created: 2021-02-20 18:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34d48e1e25f413048b1632fe7b0828cf SHA-1: 76c1a2c078722eb3219216ca2ca83f5e93198cf3 SHA-256: ef3fcbb9d1ed7ee5e3eed793944c0a35c5ebce4fc0d7a0c61c9f46c73a0b4a08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample as a link farm on disposable hosting, reinforcing this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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/123?utm_term=long+haired+dapple+dachshund+puppies+for+sale+florida PDF link annotation
    • http://lesantyqas.online/vedisolidetem4xdco.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/rimedabedajufenot.pdfIn PDF document text
    • http://titanof-filtr.ru/zurifugibojitiruzalalunomnfgq.pdfIn PDF document text
    • http://blacklaser.ru/48495485011zmok4.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/9xiibh6/gofowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443810/normal_5ff4180fbad46.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/todigobaxuvisjcdt.pdfIn PDF document text
    • http://emmetrix.net/63636514018x1t35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5feee05f920d8.pdfIn PDF document text
    • https://wovitinukid.weebly.com/uploads/1/3/4/3/134372120/6080523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fdfa228b2365.pdfIn PDF document text
    • http://limons.space/dream_of_flying_piano_sheet_music_pd8o0l6.pdfIn PDF document text
    • http://vulgargirls.fun/461500043537xxm9.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/BU1igjc/use_your_imagination_jump_over_the_moon_song.pdfIn PDF document text
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/vibilomi.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/koximo.pdfIn PDF document text
    • http://disconto50.info/56528215784iy813.pdfIn PDF document text
    • http://net-klientov.ru/dizatunukezobojamafapet34pw.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/gEThhhc/tugug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_5fe73b5b4e458.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/NhhgekE/cod_recipes_keto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/paperboy_dj_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/xuwaxesev.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/pitojobutuvuxijisojaxus.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/linkedin_bio_template_for_students.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_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 5360 bytes
SHA-256: e471f57e23f2072a9eb1b46353c3c8489f087e40dafccc9a7e71a44a0c1646bb
font_01_sfnt_off0001322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 12420 bytes
SHA-256: 6529c88f9c9eb62079b9cc6f6920cb9bc5b0ac2926d9de778cd5015d45227593

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