Malicious PDF — malware analysis report

Static analysis result for SHA-256 986d6fc3b83b3a56…

MALICIOUS

PDF

114.0 KB Created: 2021-04-12 05:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36906e4c9a71fe97e6d99f5ba2332531 SHA-1: 9974e719fe9c4988608593d85ae0b391c6979361 SHA-256: 986d6fc3b83b3a56c036112d9cbf401319b57df6ae40df2e1cd3697fbdab77c1
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 0.9993

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://midufefew.ru/strik?utm_term=blackberry+passport+turn+off+touch+screen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fe1367300d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3be2372b8.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/a073422c8ed.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/d92c4751a.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/7458637.pdfIn PDF document text
    • https://miravavomi.weebly.com/uploads/1/3/1/4/131410597/xejoxira-wofaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_601b2aa22cd67.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/galukiza-beroxigikewa-junupawodeji-pufetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_60072496b02cc.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/6MieBgc/village_and_farm_game_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_601603597c84b.pdfIn PDF document text
    • https://cdn.sqhk.co/mubasetopagu/heykidy/code_shark_evolution_roblox_wiki.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/zaponabubemurefiboxo.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/nujezuvamogemekewoj.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/cdf7a81013bf.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/605b273f46663ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_1358dd268e764e4180db4f30969aaf1b.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_839de856836d4c4b803bb973da2c523d.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_766ed6f0514b488091bcbbe47009c29e.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_4c826d6449df434c8c1c2dd6cbd80499.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_cf2549e4eac94429bade0454afc9cfe1.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_6569a9b584c14cf1978995155bb32fe7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E7 5292 bytes
SHA-256: 4056105ceca7c42eff730d54ddba51fc6b557a9f7d4e82059bd73b8a5472eccb
font_01_sfnt_off000183e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E5 11660 bytes
SHA-256: 065904d403324e5576f342ea01d2cbb9e6844bb2e31e21fd0b91ec4012adc277
font_02_sfnt_off0001ab63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB63 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230