Malicious PDF — malware analysis report

Static analysis result for SHA-256 66add8581aea2c43…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 16:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f13a4926350796b635076beb13183694 SHA-1: b13cd67360bf59e38af1e6591811d336629d17b0 SHA-256: 66add8581aea2c433f3aafb95afa627b3abf44bc3d204a57857497d8fe1889f4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/wix?keyword=consumerism+examples+in+brave+new+world PDF link annotation
    • http://get3creditscores.info/compare_and_contrast_mitosis_and_meiosis_answer_keypqzov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_600f7880bc233.pdfIn PDF document text
    • http://chempion.coffee/perfect_english_grammar_present_perfect_exercisesjo9ma.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/3249471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_60445ead4f8ff.pdfIn PDF document text
    • http://dosijaruwiteli.mywebcommunity.org/wexowesomukitodanuxad.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/28234.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/yyEgigd/gym_gym_workouts_personal_trainer_bodybuilding.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/hdJhaif/sivefoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6017ccb812993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_603d4ade3c34c.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/boxamaranizidilefoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_60403cad75c30.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/vjejeHU/contract_killer_zombies_2_origins_apk.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/majesty_here_i_am_chords.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/pdf_yasin_sharif.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/245c6bd8.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/zibivubuvadikik-nodisu-tumipan-fagokokoz.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
    • http://jilawovo.epizy.com/46770048392.pdfIn PDF document text
    • http://rilevoka.rf.gd/98689379789.pdfIn PDF document text
    • http://putojeferef.rf.gd/9844161158.pdfIn PDF document text
    • http://bexudigibop.rf.gd/improving_active_listening_skills_at_the_workplace.pdfIn PDF document text
    • http://kiwexenuraxenab.rf.gd/man_s_search_for_meaning_summary_download.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/bubirijeberodu.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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5288 bytes
SHA-256: 714443344ce7ae1b600acce75af4b879243df64a9e289380c59a3d37871274e4
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10368 bytes
SHA-256: f493b81840dc97170eb4dee7021bd467cc894c0fbfca20447b25e884ab726afd
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333