Malicious PDF — malware analysis report

Static analysis result for SHA-256 70537df4adb28bd9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-13 23:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 142286d873743d9c45294fad489e15d1 SHA-1: 22acbd9482ff2dd941b1723bafb6acfdbaeb5532 SHA-256: 70537df4adb28bd9e26c678823b677ee2d0b527f0bac0b0a2275ee956d993206
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 0.9997

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=can+you+use+a+portable+ac+unit+without+a+window PDF link annotation
    • http://pixunune.sportsontheweb.net/14998681240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_6019bf26465fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5ff3af061c3ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/cJJMjjO/understand_home_electrical_wiring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_6037100c9f8c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/ZX3J7PH/wingstop_locations_in_us.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/husqvarna_rz4623_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/YhiigAU/letadope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_602dca2cac7df.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/3d_shapes_grade_1_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/i89iNOS/best_performance_car_engine_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/hgjichf/16633374451.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/55270247068.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/1f21a3e8-43fe-4711-aa08-407d0817ecb8/where_to_buy_weight_watchers_bathroom_scales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eabef95-1650-4629-a941-464c86fa1efe/38238544318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7bb7a2-63eb-41ca-a83b-e63633f7cc09/what_order_to_read_the_black_witch_chronicles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a1f3c1-2ba3-4ea4-bfdb-d1b936f348f1/line_6_fbv_4_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08cc28c-da91-4448-b160-63b57971477f/devi_bhagavatam_tamil.pdfIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_8faab4b53047418a862b782c4516eb20.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/why_is_my_lg_front_load_washer_not_draining.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_42dc9e28e4c74f8aa33ee965e1f2df48.pdf?index=trueIn 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_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 5400 bytes
SHA-256: 55ea90ccd436b559783a3dc840e001ee06afa26f51ad464715df4032f41c1156
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10864 bytes
SHA-256: f7213c1111f5100572f07b02119e634c1fbea427b3e6d62aade9db8a22b38690