Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ec996a10ab6d37…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 20:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 883c8e063ee12043860b653b42c52844 SHA-1: e02eee296c77305afeccb826df11938361cb1496 SHA-256: d5ec996a10ab6d37fc03254afb988ea3eaeee205a23a0ed13ea748ca5e3a944a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=fun+kid+movie+trivia+questions+and+answers PDF link annotation
    • http://bomisedoxu.mywebcommunity.org/dapple_dachshund_puppies_for_sale_georgia.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/e5f627053eff.pdfIn PDF document text
    • http://sallehq.xyz/cause_and_effect_paragraph5snm5.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/sprinkler_irrigation_design.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/f2ac46cee5ad8.pdfIn PDF document text
    • http://sujolisake.medianewsonline.com/gozebuburakizilepetot.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/tying_knots_book.pdfIn PDF document text
    • http://euroshopme.site/4603602168ev09x.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/18296414886.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/83160752467.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/divexikav/find_kanai_s_cube_guide.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_7e923dc9cf65423f9dae1d403f95eac1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/54525322645.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/langston_hughes_merry_go_round_analysis.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_92b4c4493fda4a4fa42dd933057ddf0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/free_boarding_pass_birthday_invitation_template.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_652255dd734843a9bf21074ed2e2c33f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/posukoneke.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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 5236 bytes
SHA-256: fb705f8727b60506addee3006482365ccba182dacfe20c323abbac0676501f44
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10968 bytes
SHA-256: 01979f8ab061874697b2ce70cd090bf0da433e98338e908d88be3e7a4dafe75c

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