Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfaff6044998e90…

MALICIOUS

PDF

78.7 KB Created: 2021-05-11 13:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e01ab2103d32fffe750de2cca2fc466 SHA-1: 5aa6b189d0ca725d830bc2c1f4365de14d04f559 SHA-256: 4cfaff6044998e90936a80252346ebd9378d159b131b91fae6e55830fb2702b2
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 0.9995

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://seumenha.ru/strik?utm_term=physioex+9.1+exercise+10+activity+4 PDF link annotation
    • http://sweetmeet.online/88312378310jxlah.pdfIn PDF document text
    • http://ledimpress.biz/sims_3_expansion_packs_object_listj2gi0.pdfIn PDF document text
    • http://svoytrylend.xyz/how_to_use_garmin_gpsmap_60csxzmutg.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/pelopobaj_patotilapota_boxarodufab.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/xosejidijin.pdfIn PDF document text
    • http://italylife.pro/34938042004lz45u.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/4817691.pdfIn PDF document text
    • http://shishkin-seed.xyz/ice_fishing_lures_for_lake_troutv4a7b.pdfIn PDF document text
    • http://sayseedokg.com/rofuvikowizowofi91f6x.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/beatles_yesterday_easy_piano_sheet_music.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/sepusavugipobugerap.pdfIn PDF document text
    • http://natbeach.space/what_is_lexus_gx_460_premium_package3uyry.pdfIn PDF document text
    • http://prodson.space/39802610534c5b7p.pdfIn PDF document text
    • http://itabody.space/bendy_in_nightmare_run_mod_apk_revdldr25v.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/caso_clinico_de_anemia_ferropenica_en_el_embarazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://kojenixerog.myartsonline.com/relifutetaw.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/rrbald_group_d_answer_key_2019.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/55739997570.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/cassandra_definitive_guide_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/paras.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/18208014225.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/topic_specific_vocabulary_the_environment_answers.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 5556 bytes
SHA-256: dd19868dc8c196fd7018c5198eac1f8a9af77587c575f50e8ff560175ac51a1a
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 12008 bytes
SHA-256: 969f6f4e7d91417fb7d6983c08318fbf23ea3ad52d9c0ae84296ab7c4b53016e