Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbd44c3c04ca034…

MALICIOUS

PDF

82.0 KB Created: 2021-03-19 14:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 534e231bfd9c7b0290955c564cf7203e SHA-1: 632e17438911f35ca71c2f918951e4a60d4389dd SHA-256: 4bbd44c3c04ca034a1ca5e755d7dd2976ba8af98b0bf8ed717200fa8d9af0e83
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body's obfuscated content and the presence of numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=cool+games+unblocked+at+school PDF link annotation
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/1235276.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/gaduviz.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/94265339512.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/83518942586.pdfIn PDF document text
    • https://todewuxolu.weebly.com/uploads/1/3/4/6/134616468/wopuza-veborufolimex-juvenix.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/3350527.pdfIn PDF document text
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/875996.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/acido_fosforico_formula_balanceada.pdfIn PDF document text
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/832a4.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/7968984.pdfIn PDF document text
    • http://segorewadidet.iblogger.org/bal_hanuman_2_song.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/rozot.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/3da2e65c78a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakakixutuv.myartsonline.com/93060481418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feab1c54-a380-4306-bda2-f8f3d314428e/56099567093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba69a2e7-d20f-434c-acad-7fb9ceb45436/98374911173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408b77e1-ba7b-4003-be1c-7a192a81a1f4/how_long_does_the_elimination_diet_take_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a349749-2fd4-4aca-a565-48b32e932d93/how_to_disassemble_my_nordictrack_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ba3088-4ce6-4d02-97c9-cffee4f07618/c_programming_language_full_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b92e33-c65a-4d48-9eed-fae335e2062e/book_of_occasional_services_agape_meal.pdfIn PDF document text
    • http://fipabazubigu.rf.gd/78418028496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02581d01-8462-4ea2-a2f0-7aa175ecb821/does_walmart_sell_pulse_oximeters_in_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d6939f-beaa-4438-b57c-2564f9ed5c54/14348753375.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_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 5364 bytes
SHA-256: 860d9b7e94ce750f7451e83a97e15b45f593c9366697f7827a162447c0bcb879
font_01_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 11456 bytes
SHA-256: a609f854d3e030e1b5e8c608be1fbe10bab78180618ae573e21e206e7646bb0c