Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a59171c17b7f3ea…

MALICIOUS

PDF

101.0 KB Created: 2021-04-04 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02e499eb119434d465424fc1b6476ea7 SHA-1: 4647c213fa4b133fdf13a2e6b37fac8078f19704 SHA-256: 8a59171c17b7f3ea307b1e605bc0f01d3a64ba8bb7c219b60dd6e2244546a6c1
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://gelupulofevabek.medianewsonline.com/what_streaming_service_has_the_shining.pdf In PDF document text
    • https://regivuno.weebly.com/uploads/1/3/1/0/131070843/fimitax.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/blood_of_elves_goodreads.pdfIn PDF document text
    • https://xovosoze.weebly.com/uploads/1/3/4/3/134370725/00041d58da4.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/juxor.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/mozigarilim-zezameditu-rituvu.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/95423.pdfIn PDF document text
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/vabogukoluvatit_vuleputubara_jixumaf.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/41ccb6e.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/4709599.pdfIn PDF document text
    • http://finonit.mypressonline.com/ielts_reading_samples_download.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/6440107158.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/3730b42fa0834fb.pdfIn PDF document text
    • https://fanazogi.weebly.com/uploads/1/3/0/9/130969494/junawimixevulimoreb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=best%20switch%20games%20january%202021PDF link annotation
    • https://s3.amazonaws.com/vasofirida/making_models_of_covalent_molecules_worksheet_answers.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_9536c7ca9e174920abf16c75afc2bfbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/how_much_does_deltek_cobra_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/ruwubibabupuzovev.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/before_we_were_yours_by_lisa_wingate_amazon.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_e2a8d75e63e147749ddca36f767a8889.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_f98f8ba6c3fe472cba699e18e24d3134.pdf?index=trueIn PDF document text
    • http://puribisipup.atwebpages.com/auxiliaire_etre_ou_avoir_exercices.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_a14de1f65fca4f8284e51b3f9f04b2f9.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_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 5824 bytes
SHA-256: f6f5150dd9d758b4020686914dc8c3ad87c902a8e1a89ed5fa9f56fa4dd0b4e1
font_01_sfnt_off00015e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E78 11920 bytes
SHA-256: 54eda02384e2ae35bb11f93e3b87edce23098e92c6e088e0d72efc213ef9e938