Malicious PDF — malware analysis report

Static analysis result for SHA-256 305a06c4d8dbd987…

MALICIOUS

PDF

98.5 KB Created: 2021-03-23 21:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b5a9105d62bb9828db6b50929be8382 SHA-1: 49a676975585f834713f597611bbb47f50e1b556 SHA-256: 305a06c4d8dbd987b1511548d0cdd6e279ecc53ffbfaa6dc681eeeb6b854cdfc
156 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to a potential link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bologen.ru/award?keyword=alfabeto+coreano+en+espa%25C3%25B1ol+pdf PDF link annotation
    • http://jidevutijosu.iblogger.org/define_teaching_methods.pdfIn PDF document text
    • http://kivabixedopat.22web.org/77498879646.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribuseparunowo.epizy.com/59775000192.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/bowexevuvuvikitugudet.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_a8a6113d6e8c49dca9cafdfd9252c808.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/7th_grade_math_worksheets_rational_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/1283669924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae4c208-b0c6-477d-933f-470f380d00f0/fivegojamebajerowuvela.pdfIn PDF document text
    • http://favisosemetidid.rf.gd/62800841269.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/48092404280.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/16966361317.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/telugu_movies._com_2018_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab7bc23-dd6a-42f0-9146-41b6ff2e3064/debiwokawigukizevejum.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/holt_science_and_technology_forces_motion_and_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/oxford_dictionary_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/sbrandizzare_android_tim.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/let_go_free_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21265bb-fdc5-41b7-a554-cad4d1adbadb/gopro_hero4_silver_iphone_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/avery_5161_template_for_word_2016.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_0276596bf1aa4877b56f510abd8e16d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/neturuxeni.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_6ecb3542c4a5490098a87474b2fd0ee1.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 19268 bytes
SHA-256: 87f663c843698750f4c705b5de65116a88be327eee0a71570e5da03c4195fc99
font_01_sfnt_off000135e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E8 1572 bytes
SHA-256: 452612010bf92904adaef4bfd0d246ec5f24367bf67eb47c7737d6475a0c45d1
font_02_sfnt_off00013deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEB 5492 bytes
SHA-256: 0b96ebfdd9ddc757d8ed94e15a186c7d9c44ecd334106a0223ecf7b0ce817224
font_03_sfnt_off0001505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505D 12772 bytes
SHA-256: bf7f7c88accd5961e4a44f15a24f6339c2853467ff0802814c5074f24c851fd3

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