Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1968cad3b8c1bf9…

MALICIOUS

PDF

68.5 KB Created: 2021-02-22 10:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f890cf5259fc49ab029d5aa54cf4af34 SHA-1: c833f3a236c6545412bc6b7acb7a6c0bc7ae4cd4 SHA-256: b1968cad3b8c1bf98b127c9e350f42751f950ab40b01dae1b58e8177742e20ad
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 0.9998

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://crophysi.ru/wix?keyword=women+in+metal PDF link annotation
    • http://ccckkkkk.space/65772394488zjd3m.pdfIn PDF document text
    • http://samo-katim.ru/mr_badman_kidi_videop2wup.pdfIn PDF document text
    • http://vigastlens.xyz/vocabulary_test_online_for_greknpwt.pdfIn PDF document text
    • http://sputnews.com/backpage_body_rub_new_orleansxaiz7.pdfIn PDF document text
    • http://supportcopyright.net/patologia_humanardb8v.pdfIn PDF document text
    • http://rewita.fun/can_arthritis_cause_plantar_fasciitis840yk.pdfIn PDF document text
    • http://rewita.fun/how_to_use_craftsman_125_psi_air_compressorrc184.pdfIn PDF document text
    • http://iranianvc.com/best_medication_for_public_speaking_anxietyfs94g.pdfIn PDF document text
    • http://gnfcns.info/zowubugujosaxilukamam8h2.pdfIn PDF document text
    • http://cashbackk.site/82098014017hip44.pdfIn PDF document text
    • http://ridunculus.com/tengo_ganas_de_ti_libro637au.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/download_subtitle_divergent_bahasa_indonesiaujhfn.pdfIn PDF document text
    • http://smeh-mif.space/2032166687dotyp.pdfIn PDF document text
    • http://dayzcommunity.info/merrill_lynch_mortgage_phone_numberodk0q.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/tabobujimo/city_of_ottawa_recreation_guide_special_needs.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/kabbalah_qliphoth_and_goetic_magic.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/video_er_instagram_apk_pro.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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 4568 bytes
SHA-256: 0a1c0dcdc157120ce20bd9dee4c150919e15de07930f9a0c4a741d6b6ac4b879
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 9928 bytes
SHA-256: 214eef0b04c25492cb918e247ac65c315db208ac72e6157b9bcda39359fe3af6