Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8bb5d3c8fd46cb…

MALICIOUS

PDF

91.8 KB Created: 2021-04-08 09:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c74e864995e6b729bdcfff72cdf4b79f SHA-1: 8a4eb7dc5a505afbce56a315d0ae6258d69a7fdf SHA-256: 1f8bb5d3c8fd46cb4102440286e17e9dff431e05d8df8557ac0a3335f86bf987
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://xezojetit.ru/123?utm_term=balanced+scorecard+template+for+healthcare PDF link annotation
    • http://ladekepevij.mygamesonline.org/toeic_answer_sheet_template.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/jonaver-suxejew-kimukotejodelu.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/structuralism_in_psychology.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/gepudolewubibebod.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/14414126636.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/d2ce97fc6.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/vokiviripivuzamapo.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/13074987059.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/nikog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widetunipet/calculate_bending_moment_for_uniformly_distributed_load.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_0001999933a04ac6bf7fd78ec9f0ce6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/how_to_know_someone_login_my_facebook_account.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_cdef444a255d43c3883810b18993a996.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/crusader_kings_2_guide_to_war.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/8907021332.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_28e87acc88a14e9fa704572f391dfed6.pdf?index=trueIn PDF document text
    • https://bb4a6ffa-96d3-4132-94d3-a1d2cbc717b0.filesusr.com/ugd/0182ef_b00803efb0894d18bc41d0aba2e7a7ef.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_254f6148591a4677b9f33802bfef9ee2.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/having_a_coke_with_you.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_2af893ed881b4c239ac143f8f14aa289.pdf?index=trueIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_14babe3f12964673b3a055f387bc7c19.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_dda62531310c421d961e5bd27a4742a7.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_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 5444 bytes
SHA-256: ca7e120796cf99eded74ea7fa62c73d786e3a12daa2cb62843b3fdbdb3fb1b29
font_01_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 12348 bytes
SHA-256: 9afb6c46c22d42f9fe0264109f170f199a172f9806e0bc16d2cb67101a1a7ed4

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