Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d09eb18967e112f…

MALICIOUS

PDF

99.9 KB Created: 2021-03-26 17:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a67a9d274780c7409de83de993268447 SHA-1: b601ddfc0be300531622bce38a1afefe5add4618 SHA-256: 1d09eb18967e112f8503916c30aab7c0cc8a812391095d1eb1fd324beecca7e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=culinary+arts+lesson+plans+for+high+school+students PDF link annotation
    • http://wersita.fun/4_pics_one_movie_level_76_answersi1zng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_602a88f9db4fd.pdfIn PDF document text
    • http://lp-consalt.ru/what_is_the_best_ipod_nano_to_buyr1thn.pdfIn PDF document text
    • http://aycotoro6.xyz/63358893447s0p6e.pdfIn PDF document text
    • http://qqkaxes.xyz/esv_bible_versioncon91.pdfIn PDF document text
    • http://cmb-societe.com/jarifebevamebaxaje9dau5.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/aVnpv1G/dwight_schrute_car_gif.pdfIn PDF document text
    • http://pagebake.com/kuvowujopl8de2.pdfIn PDF document text
    • http://farvestnn.ru/434214480197zdvr.pdfIn PDF document text
    • http://qiwi-wallet.online/31749102584wbxpv.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/hgihji5/rhyming_names_for_kiki.pdfIn PDF document text
    • http://italywow.pro/brinkmann_gas_and_charcoal_grill_smoker_attachment2r8wj.pdfIn PDF document text
    • http://re-prime.ru/zeberanamivoajz65.pdfIn PDF document text
    • http://roskycnmx.com/videos_para_aprender_ingles_basico_gratisx60ka.pdfIn PDF document text
    • http://photoforce.ru/what_do_white_chrysanthemum_signify_in_japanese_cultureednb5.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/eyJhgcr/mejufuxewozosusepadamoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_60140f59ef150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mulerux/rovelimepepir.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/c5.0_algorithm_to_improved_decision_tree_with_feature_selection_and_reduced_error_pruning.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/essay_for_grade_6_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 5424 bytes
SHA-256: 14a6fc5b9d6f150ce94e357f25840c57b4468cd7d3b28491e2c155349dc97d8a
font_01_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 11480 bytes
SHA-256: c8783b21b761cd334a569917d5522b0ee647c68dee79cdc98ff4dce9379941cd
font_02_sfnt_off000173e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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