Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a29cd617820a2e…

MALICIOUS

PDF

82.5 KB Created: 2021-02-24 01:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c1b59d7c7ee4a103af6a34bc23bdcf4f SHA-1: 973272ba36cf9158844dabd54c600bf5b7c8837f SHA-256: 16a29cd617820a2e63fa7b64914aae5a1096306ce87c5e0d3c475ce0b1e63ce4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further supports its malicious nature. While no scripts were extracted, the document's structure and URL patterns strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cheap+dirt+bikes+near+me+for+sale In PDF document text
    • https://cdn.sqhk.co/xubulozirod/h3ACqig/royal_family_tree_the_crown.pdfIn PDF document text
    • http://cheapkeys.site/selazijepewaratotiwemaba9stwv.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/jfhhdjd/guilty_conscience_070_shake_tame_impala.pdfIn PDF document text
    • http://dorightpress.com/84474651567mt5l5.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/7443792.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/chgjbf7/fajuzewa.pdfIn PDF document text
    • https://rakurewirusemew.weebly.com/uploads/1/3/4/0/134017151/wadafuwo_siketapulujuj_mesunupag_pexuxexowivewe.pdfIn PDF document text
    • https://cdn.sqhk.co/vilevefe/MQghhg6/brick_game_9999_in_1_game_list.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/8aUggZg/ludovico_einaudi_experience_sheet_music.pdfIn PDF document text
    • https://legelopupusida.weebly.com/uploads/1/3/4/3/134350366/rejazisifolo_pegijazufameseb_kogiwisipemo_tizurojebujoko.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jhut5w9/zamozixodofesotavidafifo.pdfIn PDF document text
    • http://se-mrush.com/malcolm_gladwell_the_tipping_point_chaptersac5k2.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/dafakemupubenixipem.pdfIn PDF document text
    • https://zexexidiwe.weebly.com/uploads/1/3/5/3/135330220/2685221.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/xiQqhd4/wiligafugajed.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/muvarelo/burilaviwuperefuvan.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/64061365430.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/brewers_association_beer_style_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/top_10_android_phones_2019_under_20000.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_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 5392 bytes
SHA-256: c89f73d9a23e4a4ef0c63ea7982cda84bfb5031109d1b28e1b062ab1e36f57c7
font_01_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 10212 bytes
SHA-256: a3f5ed8bb2b30f2c19ed410c39bffd5fb2bacb575e49f4e12fb76d905e0a9b94