Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f8b2ac96feef57…

MALICIOUS

PDF

94.9 KB Created: 2021-03-23 05:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1878d9c3124dda222a67641d7500422c SHA-1: 1053f0b987345033dc97bfffac805c4c91012f9c SHA-256: 95f8b2ac96feef5756ee97e6e20685f14b0efe76af71e1858a1a657c93f313f5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jottigo.ru/strik?utm_term=libro+de+los+sue%25C3%25B1os+y+sus+numeros+de+la+suerte PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486522/normal_6039eafc08dc3.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/fzjiktJ/3488222862.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/Gvfhd3M/the_wolf_of_wall_street_netflix_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403947/normal_5fc69da18e0b2.pdfIn PDF document text
    • https://volifaredibeg.weebly.com/uploads/1/3/1/4/131437601/9881926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fe81822d5cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5ff6531f7ce85.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/N2QvSgi/pilexuzegejusubik.pdfIn PDF document text
    • https://zibomuloxeju.weebly.com/uploads/1/3/2/8/132815028/8ae544107e530a6.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/kefefetafij/26393345185.pdfIn PDF document text
    • http://furamexexi.rf.gd/berio_sequenza_x.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/61272309641.pdfIn PDF document text
    • http://todabopojexojad.epizy.com/lesson_7.3_linear_inequalities_in_two_variables_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/march_2018_sat_qas_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/kewazolal.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/duxonowam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fd63d6-db0a-4ac7-8a38-6610ba3fc0fe/93699124511.pdfIn PDF document text
    • http://tuzipani.rf.gd/android_sdk_28_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c587aa41-4045-40b4-a5b7-1b68488a432f/what_is_the_theme_of_annabel_lee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe8630b-706d-4419-9f49-6609ffdaab89/86685191238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9102d1ba-bc70-47d0-9ec8-536d637913dc/25434808049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b7609d-1615-4de7-86e8-ba31a5c3979f/the_fisherman_and_the_jinni_moral_lesson.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 5364 bytes
SHA-256: 5da8af30b5173cc9a6499b305223f9347ae3807cb3b0941c800b9adbae726c83
font_01_sfnt_off000145cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CD 12192 bytes
SHA-256: cd7ff73e07564b26c049356e3658d51f688599167d527dcf37d71dfadc42f6a8

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