Malicious PDF — malware analysis report

Static analysis result for SHA-256 848220c120cc89c3…

MALICIOUS

PDF

97.2 KB Created: 2021-04-15 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34fe390ab74bbe39cdcdc4db4b718b6 SHA-1: 93c8ca99a0de58be9d9f8f1eeb002ab1dfd14d00 SHA-256: 848220c120cc89c3b036cb8ae9a13aa0a5f9e41743581ddffeb42845a780a853
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=language+techniques+used+in+romeo+and+juliet+act+1+scene+5
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/laxisivemumibik.pdf
    • http://naturelofo.mypressonline.com/lower_boundary_of_the_zone_of_proximal_development_refers_to.pdf
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/1e81b08cf7c34b4.pdf
    • http://tilikef.mygamesonline.org/59507769812.pdf
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/lisasugetimevis.pdf
    • http://kidupat.getenjoyment.net/adrenergic_drugs_medicinal_chemistry.pdf
    • http://didazema.mypressonline.com/what_is_salt_water_cure_in_feng_shui.pdf
    • https://loturevigud.weebly.com/uploads/1/3/1/3/131378985/dee742c46229b90.pdf
    • https://cdn.sqhk.co/negenowiji/xb0geu9/bigawusemin.pdf
    • https://cdn.sqhk.co/jotenitix/hiaggic/translate_japanese_picture_text_to_english.pdf
    • https://cdn.sqhk.co/kitolitik/hjFNI9g/nebelisadivuvaximeg.pdf
    • https://cdn.sqhk.co/lakanodip/EskLdha/45380860419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daselex/itunes_for_windows_7_free.pdf
    • http://memamawu.onlinewebshop.net/espresso_english_podcast.pdf
    • http://badamowafe.onlinewebshop.net/best_app_to_download_books.pdf
    • http://guriseb.myartsonline.com/lexilamugegapu.pdf
    • http://gototura.myartsonline.com/john_deere_44_snowblower_gearbox_oil.pdf
    • https://s3.amazonaws.com/kifutizijebuj/favuxevozimoxofifirufirod.pdf
    • https://s3.amazonaws.com/jeromopelurab/professional_development_plan_for_teachers_template.pdf
    • https://s3.amazonaws.com/mawesenasijoser/12352085345.pdf
    • http://sajulugebimisu.myartsonline.com/46749030157.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013907.bin
40f1388eab2084d940225994d4cf914a072e22dd9791bc0b129539e15f8df3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 5672 bytes
font_01_sfnt_off00014c2e.bin
3776afc0822b5e9be2d700ab8276d7e69b068df24f4a5f145741d2d2237fcc26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2E 12088 bytes

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