Malicious PDF — malware analysis report

Static analysis result for SHA-256 664bdcd9bd633380…

MALICIOUS

PDF

77.6 KB Created: 2021-02-15 11:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c3d5e1421d79866a722aa73da30fc72 SHA-1: 95fa4581795706bc87bcd9d7e1978eb0690e776e SHA-256: 664bdcd9bd63338002a6617d676ea415df435047bedd8d1cdcb5d25ca65f8d98
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 links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of a deceptive error message in the document body, combined with the link farm heuristic, suggests a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=error+code+003+navien PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499021/normal_6013465779e48.pdfIn PDF document text
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/kirosegumobazuzi.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/tomepanodufowil_xovogipanada_zerena.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/jaL5ij4/fantasy_last_name_generator_human.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_6009bcf373637.pdfIn PDF document text
    • http://instapriz.site/sound_effect_free_download_mp3cif6z.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/YEpheih/wireless_barcode_scanner_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/fahIAgj/addition_flash_cards_math_help_learning_games_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6015922342bb9.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/7873c30d4a4d4c.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/8a1449d1747d75.pdfIn PDF document text
    • http://zootime.store/18663457227m57w2.pdfIn PDF document text
    • http://samettemiz.xyz/math_aids_reflections_answer_keyilh94.pdfIn PDF document text
    • http://yewes.space/unicorn_picture_editorhdwc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5feb5fa7a5ecc.pdfIn PDF document text
    • https://cdn.sqhk.co/lobitukojuro/3ZAXZuB/81135421256.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/VjeyjfT/73699288215.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/iejjzih/13973584978.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/figugipopar/kisijijojeturex.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/6447749709.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/data_analysis_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/edinburgh_playhouse_seating_guide.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_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 5044 bytes
SHA-256: 80e62f801bb39b8777243708161fa95ca8ea8c3172ed7a80a0c6e1e13497e863
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10180 bytes
SHA-256: 62de1858d6d46a678cad6905dd87636ccb96d6a40c01190b873ed35e2a2ec4c5

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