Malicious PDF — malware analysis report

Static analysis result for SHA-256 724170f75270dc62…

MALICIOUS

PDF

109.9 KB Created: 2021-04-07 08:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b6ecb067173c21980f548cc754dcf19d SHA-1: fc6d2285922d82c37b7aed5f9d40d31a586ee514 SHA-256: 724170f75270dc6272400fc7896c5b0c102ce1ff918684ad0985e47d657705c1
186 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, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://jacksth.ru/123?utm_term=famous+quotes+about+school+uniforms PDF link annotation
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/3925701.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/pukiwibo.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/cec51e11e340b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_600b5910b3886.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/133766.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/bangla_comedy_natok_script_free_download.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/bovutawurus_levesipavilipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_604d6c00273a9.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/how_to_get_an_emergency_doctors_note.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/novixe.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/aef3c59eb8b3c.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/4369126.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/ninewujumo-zubelofigoz-xobubamatew.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/faguwikam.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/klb_chemistry_book_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taberadajip.atwebpages.com/ssc_stenographer_exam_paper_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6db532e-6264-4ceb-81cb-16682bbb9d0e/bissell_spotclean_proheat_pet_spot_cleaner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1ffbbd-29dc-4f36-a5e9-db5b60816f31/kotabokanamabaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee52567-0553-43d3-b959-fbbe66965354/how_to_pair_a_blue_parrot_headset.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_0df5f9095bda43eda92617c9a0a36432.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_104afcbd3a754ec59182e21d519a9409.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c824c5ed-d13e-4abf-b3ae-c1e97a9cfeab/suzuruguzamabukepurejadox.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_be944a4e04304810bd1602fac426bebb.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_off00017109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17109 5344 bytes
SHA-256: 39770816bd30b30d8f13176012b0ab076a8395d15aa6adac3bc21a0ac80fa34b
font_01_sfnt_off00018311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18311 11408 bytes
SHA-256: c7cbaecb244f0dfb0721363996a999f2fdd8451aa5fd36155a2f9867afa5de1e