Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65effa0bacfdae1…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 04:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 24a418fea68124ecc15a0bc34cb541a2 SHA-1: e31f7d5136d41f116e22a53ec9002ec44c1a9574 SHA-256: b65effa0bacfdae1f1523f7f34c7dc1ba643122388f3a44b69cc4a27e2d40171
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one URL redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=corazon+de+ni%25C3%25B1o+pdf+piano In PDF document text
    • http://blablablacar.online/kawanosik0ggml.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/gg1ib8K/fivestars_topup_recharge_profile.pdfIn PDF document text
    • http://tonerinkstore.com/26238018763wb83e.pdfIn PDF document text
    • http://orbitan.fun/wuwejofifoloseha0z.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/jasihKV/billing_statement_usu.pdfIn PDF document text
    • http://padlamadla.site/how_to_put_two_images_on_top_of_each_other_in_photoshop36ccm.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/bRijbhc/booyah_shop_top_up.pdfIn PDF document text
    • http://ita-talia.fun/madame_bovary_part_2_chapter_11_summaryblqcw.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/rihhbaD/13463049519.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/AhfggX2/14885996398.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/xutavifawavewutup.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/swtor_schematic_synthweaving_set_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/dic2msM/27374262218.pdfIn PDF document text
    • https://cdn.sqhk.co/volotedi/Hhd3git/icse_grade_1_english_worksheets.pdfIn PDF document text
    • http://pedrons.space/33292658432h0el.pdfIn PDF document text
    • http://ital-tess.space/frigidaire_mini_fridge_9_canze9w2.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/purpose_of_writing_definition5vfjm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_28118bb8c3ef4255a5b847b969e81c2a.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_0f9b93c228424d61a5c113cf67b9af8e.pdf?index=trueIn PDF document text
    • http://mukanebesiva.atwebpages.com/agrometeorology_textbook.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_48be1d95e4c64515a791ee458aa485be.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_fd1af807b6504dd782edf5e0bc3339eb.pdf?index=trueIn 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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 4992 bytes
SHA-256: 123106c1722626e9682adf3f5fd3ff9de6bd6da9584b4a913dfc5ea34f4366f2
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16180 bytes
SHA-256: 46415db78c670e7ba2a9014b873b00e194c4505937977baf5cdaf3e37533bad3