Malicious PDF — malware analysis report

Static analysis result for SHA-256 479de1165729c89c…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 08:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 100c23ab23f5a856c1bbb777349c498a SHA-1: 3cb2368169306e6c9df76aa5fa3f26d6bd4fd242 SHA-256: 479de1165729c89c870338d7bfb3333ecef8fcc81be3078d4c318d4f30aa90be
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which appear to be disposable hosting. The primary purpose seems to be directing users to a collection of links, potentially for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/award?keyword=aicha+paroles+pdf PDF link annotation
    • https://cdn.sqhk.co/vimexuda/jaavz4P/okc_thunder_roster_2012.pdfIn PDF document text
    • http://natiral.space/fudogafefujubinasaseluy438r.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/hTgehae/6111297784.pdfIn PDF document text
    • http://dutov.org/what_does_error_cf_mean_on_a_canon_cameras12as.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5fe1031425697.pdfIn PDF document text
    • http://seedcraft.online/apple_airport_express_a1264_manual0yc7c.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/ijihxhb/baledejiwuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_60540f21c0649.pdfIn PDF document text
    • http://hristogrigorov.com/4627451425698xos.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/gfhfhhT/tesibubadopogalaneki.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/hiieI0R/78352572209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_602a9df530d57.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/r08Cqje/xovewinet.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/8ieia6Y/raspberry_jam_butter_cookies_recipes.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/gonima/32759019937.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_97f65d1a2fb4439b939c993a866e92fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/fozatoze.pdfIn PDF document text
    • https://892f65a8-8709-4275-9103-f26c144a9f7c.filesusr.com/ugd/4cd51e_2d9af709049c4c8093e776832bdfbebe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/45938303300.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/an_introduction_to_mechanics_d._kleppner_r.j._kolenkow.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_ae8d2406b5924f5d8f383babc53a9a31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/water_by_the_spoonful_scene_summary.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 4832 bytes
SHA-256: 714fd649d01adaaaab535882da9835d77d1f3f17715a0bfdc30cfea544cf98a1
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 15284 bytes
SHA-256: 7280276a94546ba20059f752d442cc23eb8b122bbbad4ca42099e26996109aca
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16684 bytes
SHA-256: 1f4cda9108afe09a7c3be235c84a2cdde824d66175966ac26caa9005a9b061ba
font_03_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176