Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19eac2c3606b68f…

MALICIOUS

PDF

75.6 KB Created: 2021-01-31 23:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ee1729fcb1c50eb10cabdb41750bcaa4 SHA-1: 9638de39a21416d8460853407f9d596e5309ca3f SHA-256: b19eac2c3606b68ffd0fff99049e04897852b4f7bf5744e974062426e5a430d6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=bluetooth+connector+for+pc+apk In PDF document text
    • http://zalavsky.ru/zelle_vs_venmo_for_rentdr61z.pdfIn PDF document text
    • http://1xbets-regs.site/differences_between_game_maker_studio_1_and_2xr0z9.pdfIn PDF document text
    • http://lg-copyright.com/milunazovod0s57d.pdfIn PDF document text
    • http://changepass.online/lovutunakalitanugun0m.pdfIn PDF document text
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/xegagaseluj-senazupuw.pdfIn PDF document text
    • http://phtech.site/dr_eric_westman_ketogenic_diet_food_list14z7n.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/Ioyifhh/domobisedifomajukiwexof.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/i1ugige/tokerujeladupexanul.pdfIn PDF document text
    • http://ryukzak.digital/fundamentals_of_microfabricationcs34m.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/jjifMIC/saladin_crusades_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/jebixusugak/wWgihi9/popular_hashtags_today_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/a60jjjj/infinity_war_trailer_2_reaction.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/rujimidujek/floodplain_management_in_florida_quick_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/decode_bitmap_image_android.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/blackpool_council_housing_benefit_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/terraform_aws_iam_role_example.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5040 bytes
SHA-256: 721a50b8e7e2362e2b954de2f639b5aeee8af9a6859add691d2e94cdee12bebb
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 10380 bytes
SHA-256: cb2b308b71335a94b90564d162aa5487a0dca85005a7562f104533e5e3a2a3c6

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