Malicious PDF — malware analysis report

Static analysis result for SHA-256 b084f16a2612758d…

MALICIOUS

PDF

80.8 KB Created: 2021-05-19 07:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 04253103feb3fd31f69ad6e95cf17600 SHA-1: 5a9c010d94378d4b93fe042c39982c72491ca1db SHA-256: b084f16a2612758df11195ef816536eb386892ef446f4f6515f7c15fa89c6118
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting and is flagged as malicious by a ML classifier and ClamAV. The embedded URL points to a domain that appears to be part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=how+to+score+nihss+in+coma PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcdcb12b3075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_6036926d01dd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_600977f424e31.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/6268787.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/getol-bejusa-selasularap-pomexibaxefuzu.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/6c38b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fea1e6041742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_606a21dcbe219.pdfIn PDF document text
    • https://gufuvixenize.weebly.com/uploads/1/3/5/3/135387571/7b7a2b045b3ae8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wolawatin/jexevojidikopexaxuwebos.pdfIn PDF document text
    • http://gesosogo.rf.gd/sitovigafotizidazo.pdfIn PDF document text
    • http://kezitiw.epizy.com/23565361526.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/commonly_misspelled_words_quiz_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dff44d5-344c-42fd-ae7c-5240a6ac66f8/concepto_de_investigacion_de_mercados_cuantitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7313b4cc-c4c5-4a15-8e2f-1e46294cc24e/netegifapebavumepiwoped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dc8c14-ddaf-40bd-870f-aa1a8a7d77e9/how_much_does_a_surgical_nurse_make_in_canada.pdfIn PDF document text
    • http://zaluboxif.epizy.com/new_hypertension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/pawuzukokutowigajeto.pdfIn PDF document text
    • http://xinirujoki.epizy.com/copperknob_linedance_stepsheets_americano.pdfIn PDF document text
    • http://dilerotarepisa.rf.gd/gizamaxawa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 4848 bytes
SHA-256: ec09a92f8d7a3f595ac6190af5c9609ef6b7ccb5be00b2f4ec276873c091eb97
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 11140 bytes
SHA-256: db37bd32190bee200e0793d97a8c0746858846cd8d4a3a7dfabdf7f157b1eee3
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c