Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ed514f66a11fb2…

MALICIOUS

PDF

79.4 KB Created: 2021-01-29 11:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 96c64057a6ab56baa998a0aa0941316e SHA-1: a3e4c828b0990c82a414d650c192cc9d9a28b179 SHA-256: 44ed514f66a11fb2d623e8b2da119fabbdcd7dacf76eacf1366f7fd726e2b675
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The document body, though heavily obfuscated, contains references to 'Flower girl basket alternatives' and metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://baarspo.ru/123?utm_term=flower+girl+basket+alternatives PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134d0d75869.pdfIn PDF document text
    • http://bopepon.22web.org/2329918166.pdfIn PDF document text
    • http://xadixul.66ghz.com/32561080371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_5fd78aed5bb80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff68a48e9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fdc89cb8d957.pdfIn PDF document text
    • http://idealica-official-it.website/merchant_of_venice_summary_act_28wwrb.pdfIn PDF document text
    • http://sapofogagesari.iblogger.org/meet_bros_cham_cham_ringtone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_600d6a799059b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_5fd1477493eb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffa4eaecbbdc.pdfIn PDF document text
    • http://fb-pageunderreview.com/word_swipe_pic_online7qi3u.pdfIn PDF document text
    • http://rutonujak.iblogger.org/story_of_seasons_game_guide.pdfIn PDF document text
    • http://vifijes.22web.org/transformers_bumblebee_movie_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5fe889796e18a.pdfIn PDF document text
    • http://nubolutlion.xyz/fantasy_name_generator_female_demon00105.pdfIn PDF document text
    • http://azalea.store/563800149585kw6r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukanimi.epizy.com/93141963661.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/la_afareye_fi_song_video.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/android_oreo_or_ios_11.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/school_receptionist_job_interview_questions_and_answers.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/luluzawum.pdfIn PDF document text
    • http://jidoxib.rf.gd/transformers_prime_operation_bumblebee_part_2.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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 5164 bytes
SHA-256: e4a0e603dc0457b5567ec3333d525ce3ba988dbdb1381e42df24bf10349f707e
font_01_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 10324 bytes
SHA-256: d76d0f671f8b1a148f2d0ac47e32442073eb1ed689e636cf09b13bd9c8eb136c

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