Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf720621ead2120d…

MALICIOUS

PDF

131.9 KB Created: 2021-02-27 21:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 96c88f889cee7f1613289397cd66964c SHA-1: 61c541d383a695f7de3fdb852f1b747aa1a64ad7 SHA-256: bf720621ead2120d7885be220218a950feb330e939e3a43e2d46d0eee6270573
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It impersonates Amazon, a critical finding indicating credential phishing. The document contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack vector appears to be luring users to click on a link that leads to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/josurob.pdf.
  • 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://baarspo.ru/aws?utm_term=where+did+the+veldt+take+place PDF link annotation
    • http://pajodumu.22web.org/golden_bc_fishing_guide.pdfIn PDF document text
    • http://pobumur.iblogger.org/92794392785.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/acer_laptop_charger_plugged_in_not_charging.pdfIn PDF document text
    • https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/josurob.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/what_is_the_average_soldier_salary.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/ginofazejaxexapobezenad.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/can_i_work_at_chick_fil_a_at_14.pdfIn PDF document text
    • http://nizozipup.22web.org/26860707376.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/179ecbc3efd1.pdfIn PDF document text
    • http://vovality.club/39846064617x2i6.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
    • http://pikowejinaruwut.rf.gd/tagupu.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/44618608974.pdfIn PDF document text
    • http://gokosipok.rf.gd/xumuziwor.pdfIn PDF document text
    • http://kanisisasulaba.rf.gd/mmhg_ka_full_form.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_off0001bd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD97 4692 bytes
SHA-256: 5991bc8091803eb3a4f7887d8e54813070fa696a9d381946310a0792cce12f7d
font_01_sfnt_off0001cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA7 11472 bytes
SHA-256: feb30a9743fad6f4fc0ed984a804420ed79b2021a70c7eb2cf5dc1f5a02ed698
font_02_sfnt_off0001f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F440 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f