Malicious PDF — malware analysis report

Static analysis result for SHA-256 832f19e8b5fbf936…

MALICIOUS

PDF

74.0 KB Created: 2021-04-04 09:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9bfd939ee49f5d3ed2cdd124ba086735 SHA-1: af871bcf6c4760ee26660d291d3bb58360963260 SHA-256: 832f19e8b5fbf936370d594a007587c471d8405a05cd3b7755f1bb02206e6638
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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://maypoin.ru/strik?utm_term=joke+book+online', appears to be a redirector. No scripts were extracted, but the PDF structure and link farm behavior are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=joke+book+online PDF link annotation
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/6374508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_600d54d757bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_604e8170e5460.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/fokobogisumoj_kitifalesez_levuke.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/soragadebaretil.pdfIn PDF document text
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/dusamafav.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/talil_vapilir_pipejabedotila.pdfIn PDF document text
    • https://mepolelo.weebly.com/uploads/1/3/4/6/134626310/gabogapusopik.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/sipixonuwoxegugo.pdfIn PDF document text
    • https://vujojetusifej.weebly.com/uploads/1/3/1/3/131398487/1315975.pdfIn PDF document text
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/611c0.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/0b0de431-f97d-4e95-9ea0-b9ab4f1523f6/samsung_galaxy_s9_unlocked_price_new.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_a481e6678a714deaad1e285f2e14143f.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_925b1a1999204e01bac66c44a063a2e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27041fbf-6698-4160-a1be-f9182ffa2e91/hello_adele_sheet_music_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eaf420-c7b1-4893-807f-bfbd57c4c912/fundamentals_of_english_grammar_with_audio_cds_and_answer_key_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6536831e-d572-4532-bd3b-29752b784c77/how_to_use_the_roomba_app.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_c314caaf97db436283b7feb164b5de0d.pdf?index=trueIn PDF document text
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_4f13d5d7e2f44dcbb5eb9cfcfa08ce0a.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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 4388 bytes
SHA-256: bd4ba76c1ac95218111b672214f7463b74be868f64be25b2f1d35a1fc349bfb4
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 10404 bytes
SHA-256: df61646f3d1713adde217bb0ac4bf966c93a6f0b7fc9dddde79fd886de7b9544