Malicious PDF — malware analysis report

Static analysis result for SHA-256 95891593283c2565…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 09:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 446e304b565fb8da3da6487932ac3305 SHA-1: 16a4b5f7760ffdf0e28247a68accfd5610fe1509 SHA-256: 95891593283c25655cd38d047fe10455051e0049422fc64b07dc16243e40239b
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm designed for phishing or scamming. 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, likely attempting to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=are+junk+bonds+a+good+investment+now PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417426/normal_6054dc7dd4690.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/45882679256.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/object_oriented_programming_in_c_with_examples.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/90329480573.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/59333583856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_6035bb73a3eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fe4efdf023fe.pdfIn PDF document text
    • https://sewigemebovoneb.weebly.com/uploads/1/3/3/9/133997870/223b695bc6226ac.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/tenitu_nikuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_601c79654b5e6.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/pekawoxodora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_604f4eeb0cc9e.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/minor_warrior_cat_characters.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/65639465831.pdfIn PDF document text
    • http://nitezebana.iblogger.org/fusionner_deux_avec_foxit_reader.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/998ee50.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/wesezuzuvalirik/harmful_algae_bloom.pdfIn PDF document text
    • http://zasegusof.epizy.com/pbe_lol_2018.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/83827036606.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/list_of_linking_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/kuloxumetoxeluma.pdfIn PDF document text
    • http://paxubar.rf.gd/behaviour_modification_model.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/bepugiwaje.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/kokojilu.pdfIn PDF document text
    • http://sugizujesel.epizy.com/xerajedasuvatakuv.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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5416 bytes
SHA-256: 10cd20c8ecb1f55bb04bb599f5602f089fc823b8e46c478b824f104ec38fd097
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 11172 bytes
SHA-256: 92d945928ca72c837631aa5904693e42596ea153eedfd93e2b7c68081a640356
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c