Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cef7ed96e03f85…

MALICIOUS

PDF

91.6 KB Created: 2021-03-21 01:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e15b81fe8d7ec7069564fc8365593b0 SHA-1: 974c86247c7cd03c31fcaeb8a075ae644425c8e3 SHA-256: c5cef7ed96e03f853c88855f9e765081d068475f6985fe0f0b28d50134fd1b8f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the nature of the link farm suggest the document is designed to redirect users to potentially malicious sites, possibly for scams or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/aws?utm_term=how+to+fix+magnavox+tv+that+wont+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388412/normal_6014629f141bd.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/97922367007.pdfIn PDF document text
    • http://zuvixomajav.22web.org/deloitte_annual_report_insights_2016.pdfIn PDF document text
    • http://kigonowepim.iblogger.org/93056351162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_601b2a04a09c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80954d70-cf9d-4f9e-aeb2-230d2cf38b51/tavowekalabufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd67c194-76da-4b7e-ad18-be69984f70c0/can_i_sue_someone_for_lying_on_a_police_report.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_26a25cfa0ed54d24a63f3875787e3032.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_cb4909f9848447dc892fd8209f5f20ae.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_a22b4b03552f4455a9b944a2397d26bc.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_aba49c97a11a4b6da40be57571631acc.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_ec5bc15aa0ba40859043897523ec4e30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0007d538-5a7b-407a-88a1-2726a3a73414/31110466148.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_98cff1dc540a40ef857d5edb8a58b9ec.pdf?index=trueIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_0cf5cefbefb24fb79b0e11c0b1382f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/737a3116-65e8-4b58-bf19-f023b35a85a2/sundance_optima_spa_flo_error.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_2c8e6af9d81a4fd7a1ba5ec0eaeaddb1.pdf?index=trueIn PDF document text
    • http://zelimasiropaf.epizy.com/emotional_freedom_techniques_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9decad-8018-4d6e-b0d8-99ffea6830ab/lakshmi_stotram_english_lyrics.pdfIn PDF document text
    • http://bumojito.rf.gd/vupoposotawu.pdfIn PDF document text
    • http://jixenefotudak.epizy.com/critical_thinking_skills_for_dummies.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_221b48badd3d40eb89b1556cdbec91a6.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_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 5152 bytes
SHA-256: 5620fb6e6875efaf3c63e472dfa63ddb8d4af75d3a48de40c7fe3b72c874e796
font_01_sfnt_off00013809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 11400 bytes
SHA-256: 19585a79492fb4f01f07a50442d4b0c6e48ef529b0873c32526b2fef2e9f282e

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