Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2a3ad51135092c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-18 10:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55b911ba6350125c171da6ff27927174 SHA-1: 4920bd65ae9d8f04572e3e19d766a251ff85e141 SHA-256: fc2a3ad51135092c632553dbd38e40e090bae2c9fa0217b1f598638ab69bc0f1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, contains text related to 'chemical bonding worksheet class 10', indicating a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=chemical+bonding+worksheet+class+10 PDF link annotation
    • https://cdn.sqhk.co/digiwejasipu/jbZxfhj/59948781528.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/lWFNzgh/dog_simulator_online_no_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60663987acf3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fff76d64e7f4.pdfIn PDF document text
    • https://cdn.sqhk.co/forebebeke/YYUhphj/bharat_gas_connection_surrender_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/b54ighb/cannonball_jellyfish_habitat.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hdbOihh/wimev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fe9563d9f30c.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/is_saitama_a_parody_character.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/xekezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_602ac0c660b1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gagfTgc/kings_road_brewery_perth.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/hehaVjj/subebilutakalizep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fe05cd223fbb.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/eje9sgd/71378404034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijowavatajo.myartsonline.com/bachelard_poetics_of_space.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/volipasupebatup.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/difolarafilemurim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432cd321-3dc2-44f8-a03e-15d5a1a0b020/ihip_bluetooth_earbuds_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6f0575-d215-4391-85ce-6af6fb419902/sword_art_online_season_4.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/konemuwivepumadibuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd71fe6e-78f5-4edc-aaaf-bbe1f83aeb4d/65940169971.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/dewalt_carpentry_and_framing_complete_handbook.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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 5748 bytes
SHA-256: f4b5e39ccd7c6275cdb983d8523a29d87a22051159f58d94f8ec7f6e64325e17
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 10776 bytes
SHA-256: 9683f287e41d16010217bdda371f379eede2219dff585db6b61f0ed55ac646f7