Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae938ba2b68559c0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 01:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b0b94ca74b17a3955fff587a7b383c48 SHA-1: 78a93936a72f56225b2aaba9093f5d9cc5dd44f3 SHA-256: ae938ba2b68559c0ea44c6eaac16e9a5401f3d374114bcedb893b7c68a7053eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain ('bologen.ru') flagged as suspicious and potentially part of a link farm. The document body, though partially corrupted, suggests a lure related to medical information, likely to trick users into visiting the malicious URL. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/award?keyword=tratamiento+de+anemia+drepanocitica+pdf PDF link annotation
    • http://zakoroxani.22web.org/chemistry_of_carbohydrates_worksheet_answer_key.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/german_etymological_dictionary.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/casio_g_shock_1289_manual.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/memobofilenabon/98580108007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5467237f-8156-44bd-b1be-f13a10574442/unit_rate_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/major_stars_in_night_sky.pdfIn PDF document text
    • http://bokatamekal.rf.gd/atenolol_performance_anxiety_dosage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f1f508-d54c-4687-9785-71212fff1dd8/87187252736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07977fe-7af2-4ae3-804b-0f5e24c11b4e/how_to_play_djembe_book.pdfIn PDF document text
    • http://fadifisevak.epizy.com/depeche_mode_somebody_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23748522-6ef8-437b-b72a-b7d9eb97b72c/xenyx_1202_usb_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b980c7a9-5f49-4d5d-ba7b-d973c9b7a686/axial_yeti_score_body_post.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/ruvede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6570ab5-17fd-4951-a2f1-3f0e28a27136/how_to_measure_learning_outcomes.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/20099809660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05adde35-105d-4b73-b1d5-bd348c41a0b8/2411926303.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5040 bytes
SHA-256: d25afeba1e8f6037c08a7f8d1a2f6b56e2b754c386c34f47893361b78b1532be
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 10940 bytes
SHA-256: 52945ea5d16bdfbebe13c5262b399f326c7e2ad1280d5694fc7186ee41be520e

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