Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef05709039916aa…

MALICIOUS

PDF

107.4 KB Created: 2021-03-15 06:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 34df292a8270430b421574eb936987e6 SHA-1: 4ba122ebf6b9cc6dbb783957fdcf34d8a19fe4f8 SHA-256: 3ef05709039916aaf60c2c63dd76d1d7fd0897ebfcff08b8f6add3a67cfce17e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fokemale.ru/wix?keyword=tots+tutors+table+and+chairs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455381/normal_6001e08f11d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601f4582cd58b.pdfIn PDF document text
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/6605735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff251ee28fb4.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/blink_malcolm_gladwell.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/mikitar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5fc61b13c6f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_602236e7285de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff7ad2f8260c.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/que_es_una_calicata.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/pupivaredipigusizejejima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fe185814241d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_600b8c889b94a.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/rimexeliniwu.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/dometic_rm2652_replacement_cooling_unit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5fe9647f1e58d.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/is_the_kaplan_gre_prep_course_worth_it.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/437720d4fb50c5.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/9e90b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/proving_triangles_congruent_using_sss_sas_aas_and_asa_worksheet_answers.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/momabovolu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 20944 bytes
SHA-256: 33097abee5839e612f83d4d59d9ef10ca8cd131363997b0b2d880d1e92d5c386
font_01_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 5116 bytes
SHA-256: ea8635c21a2d58926d88081b2a2f3c846c1812160b2551863b53559b5ddefee1
font_02_sfnt_off00015870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15870 2400 bytes
SHA-256: b4467a19d0d15570241509e6999019dd81305a176c04d57641a3b62abf50527f
font_03_sfnt_off00016312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16312 10828 bytes
SHA-256: 7eb2a77717befbc49c427c31407f1618159dd44f22b0a4b9f2908f2125d9e83a
font_04_sfnt_off000187e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E8 16208 bytes
SHA-256: c9f873bdbda2bd46fcf0f46483d5d6f782d8ca6ab34fe0eb1ccbca427ebb433a