Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f42619b15d10e5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 20:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2b75bbb66af62f429453a4324e5273d SHA-1: b5ad026e5d26fcd93aabc220d9893d400ed950a9 SHA-256: 71f42619b15d10e5db4c0547bca3238f18b458869f74ace43a9acd387a782c82
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'utm_term' parameter in one of the URLs indicates potential tracking or redirection for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=baofeng+uv-5r+antenna+relocation
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/2b0b96.pdf
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/9384832.pdf
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/lanomilekiwagu.pdf
    • http://poposiruta.mywebcommunity.org/37235778925.pdf
    • http://pasipodo.mypressonline.com/srimad_bhagavatam_english_download.pdf
    • http://venolilixe.mygamesonline.org/10641833548.pdf
    • https://mafinejolid.weebly.com/uploads/1/3/2/6/132683008/voriwelapan.pdf
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/02c057e06d2.pdf
    • http://tosefabebiribow.scienceontheweb.net/rijowonapumanolix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_21f2b44cdc4543be949748a468bdcbd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b719468e-a5a6-48ef-bf77-4616b4a723c2/97851543061.pdf
    • https://uploads.strikinglycdn.com/files/1c1d18ea-0b02-40b2-b41b-61bb092531bd/84458704800.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_747875c050b443b08f0b0a0183d4759b.pdf?index=true
    • http://nivuzujanux.myartsonline.com/business_communication_definition_by_different_authors.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_71cf734b9af54572b5ac9610a91c7780.pdf?index=true
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_6dcc90182e6a42f08e9875994128bcd5.pdf?index=true
    • http://rojanesifilagu.myartsonline.com/90781241637.pdf
    • http://tonavisuma.onlinewebshop.net/will_argyle_diamonds_increase_in_value.pdf
    • https://uploads.strikinglycdn.com/files/e5f38997-5a89-4a71-8235-52699d0e605d/12297402149.pdf
    • https://uploads.strikinglycdn.com/files/1ffb878f-610d-44f2-8fb8-c3883add19bb/how_to_wear_baby_forward_facing_in_ergo_360.pdf
    • http://vipuzala.myartsonline.com/theory_of_relativity_definition_in_chemistry.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_4c6d2da174b34306a45d546668fe1a8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db7106c3-e052-4f1b-94f8-8adbd980cb93/tiletone.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_72a7033a6cbb4b17a33322a841a21706.pdf?index=true
    • http://vasakuzepilaxi.onlinewebshop.net/kujodewugozobatubisu.pdf
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_23ca014213a342cfacb32c5732be4296.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f489.bin
a0c65c93728535148eed5cc300021b7a322a40971d3656cfd0ce2fa2383ebcdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 5136 bytes
font_01_sfnt_off00010631.bin
7605b32c42b95ea42705a977cdfe8448ac03b95e13104960be9f40f6ebee7dda
pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 11604 bytes