Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fffbc2ad19703a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-06 01:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 37a2de2078e127a3572147e5e8699fec SHA-1: f51952c64fda369f5f6aff5805fcb5524cae3795 SHA-256: 23fffbc2ad19703a9c44e87b88bed5920dc3766fc5a2a96517d74faacd6417c2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms hosted on disposable domains. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan, suggesting the primary goal is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/award?keyword=que+es+y+que+caracteristicas+tiene+un+ensayo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb85ebc894.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/9354595.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/dabonugobujopa_bukijadubekuso_juwodesedi_zotazowawasid.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/kinewuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fc79aff6e249.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/sosapofuva.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/dremel_4000_home_depot_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5feb2f84486a2.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/d_and_d_dice_holder.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/xexumijegugemetokuxodifa.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/indian_instant_pot_cookbook_free_download.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/scofield_study_bible_1909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_ed211129ab7f4cffaa1775a981fa99f1.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_a1cd125a8e2d438f8b0272cf70fdbe1a.pdf?index=trueIn PDF document text
    • http://pizuzol.onlinewebshop.net/how_to_build_a_magic_deck.pdfIn PDF document text
    • http://tokozod.myartsonline.com/73048095070.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/dusifolitir.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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5052 bytes
SHA-256: b76856e494cd42c66fe8c953a13dc9c1685c993c7d571cf1ac9863b5c461cf67
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10868 bytes
SHA-256: f5f1d6d47323b92cada13846e993e765674bad84744bf0815ef48aa93b8e8a1e

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