Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8915c941fc96685…

MALICIOUS

PDF

82.4 KB Created: 2021-02-21 12:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0014a490045df2c59228a9d06f9721ab SHA-1: 95ab6cb944635018a082882072b1defbc6dbebbd SHA-256: a8915c941fc9668583ea718eda51b467f70dca6d9cc906ef687ed5a4257f0070
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://bologen.ru/123?utm_term=literary+terms+dictionary+free+download` is presented as a lure for a free dictionary download. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm strategy, likely to distribute malicious content or phish for credentials.

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 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/123?utm_term=literary+terms+dictionary+free+download PDF link annotation
    • https://cdn.sqhk.co/fimegasaz/ha7Qoiz/siren_heads_comes_home.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/ahijchb/dish_anywhere_will_not_connect.pdfIn PDF document text
    • http://yoptan.space/jiwabavoxidotegcctp.pdfIn PDF document text
    • http://vivadoctor.ru/fiwunmioco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6024c600e6c77.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hijCkjc/73422018286.pdfIn PDF document text
    • http://mnogoturov.com/terraria_1.3.5.3_all_items_map_download8qtej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fdc35e0369bb.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/c0fKjjl/lakidopemuwejibepip.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/aiiNcja/gujarati_calendar_october_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_6001403f4e67b.pdfIn PDF document text
    • http://trynon.xyz/85690795217kiovi.pdfIn PDF document text
    • http://missunik.space/mammography_screening_guidelineskf736.pdfIn PDF document text
    • http://meetsucre.pro/ruziduridepukexujunny2or.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/gbgf5jj/asteroid_crashing_into_earth_movie.pdfIn PDF document text
    • http://secureappeal.com/new_landline_number_format_philippinesz5kuc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_600115ea3cf19.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/rewepalazamiso/ff14_heavensward_dungeon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/6433999754.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/wadoxinivojuguderoru.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/juwubokifeguzanasofeg.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_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 5304 bytes
SHA-256: 07ea58f325b4bf634c15046c906994f89820ae83a887c93803be9ebcdece4f33
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 10696 bytes
SHA-256: e22987f1b3fc4a8c14709bd4184690f8b5da558c224f277270ed083ee1826831

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