Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36e6442b44f1dca…

MALICIOUS

PDF

83.1 KB Created: 2021-04-26 08:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 357aa533eb1dab058bfe1bdcaab9df88 SHA-1: 122bb240430849de4272f64121a5ed4b7fae82b7 SHA-256: d36e6442b44f1dca548c472745654d43db78fd6477ba2ff63e52f15186efdc59
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://soxebez.ru/strik?utm_term=new+upcoming+products+2020 PDF link annotation
    • http://marketitaly.pro/sutut91uxm.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/ii7Q6gh/bottle_flip_3d_all_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/if83jcd/limeliwojeverovesoxoji.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/bVbibRy/2295546162.pdfIn PDF document text
    • http://prequester.online/is_the_xfinity_xfi_app_freelwidr.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/pejixijefofatik.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/ihajbCc/sarcasm_meme_meaning.pdfIn PDF document text
    • http://losmopaka.site/zoxapovomesawoniguvafa4aox7.pdfIn PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/3693478.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/2122918.pdfIn PDF document text
    • http://winoorama.fun/772027040917thk1.pdfIn PDF document text
    • https://jopuxokoxi.weebly.com/uploads/1/3/4/3/134350500/cada61cf6.pdfIn PDF document text
    • http://hotita.space/sams_teach_yourself_sql_in_10_minutes_by_ben_forta_free_downloadnvwtz.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/jjgehdW/spyro_ocean_speedway_orb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff17f907-236c-4f86-aaae-137df9a72e91/the_fabric_of_the_cosmos_brian_greene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f732de75-a2c5-4291-bfb2-d6b83dd64c9a/solving_equations_with_imaginary_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a003f7-e38c-46f1-ac9a-d2d90c6bae44/weloguwabudijijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea77bb1-0b81-4c0a-b81e-a6f75d8e0158/fefagikimabiwisisasiwonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227b11c5-aad8-4f60-9739-35c22b30a52f/is_there_an_it_chapter_2_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d842792-381e-4ec2-b4df-6d46bdc2d2dd/jabra_halo_smart_vs_jabra_elite_25e_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c502094a-05ae-425b-9d61-90396ab04539/35302607526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9cfd46-9ba6-4daf-823b-1b66144285cf/311122925.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 5488 bytes
SHA-256: 0b9e1629c8a2f92cf5e86249b91ef01d355b4fc48b1553367c127c4f0f32fa8d
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 3196 bytes
SHA-256: 4f480906be814ffb41cd40a268978ed77223b7290b48bd2bb3728bed5f920166
font_03_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 10816 bytes
SHA-256: de3f046e3a65784bf22b994a187f163bfa08f4961acbeb6d36d43b5fcb29a79f