Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28557689df07f99…

MALICIOUS

PDF

93.0 KB Created: 2021-06-09 05:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c63f78640f4992def65bab12c44ad265 SHA-1: e0c9d8885e22f0716167c7a3c5f4f35cb74d9bce SHA-256: e28557689df07f9954497957f90b0ede8be01d006d9e3576ae069d4bd15fd61a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious JavaScript or exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/pbw?utm_term=baka+to+test+to+shoukanjuu+ni PDF link annotation
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/1471813.pdfIn PDF document text
    • https://koxubabu.weebly.com/uploads/1/3/4/3/134314291/fedubuwekaragesineba.pdfIn PDF document text
    • https://tolopexe.weebly.com/uploads/1/3/1/0/131070113/5734598.pdfIn PDF document text
    • https://jagefefax.weebly.com/uploads/1/3/4/2/134235663/6064313.pdfIn PDF document text
    • https://vazipupabevid.weebly.com/uploads/1/3/4/8/134868359/sogarur.pdfIn PDF document text
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/kovupamogowokedoji.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/097961daabda0.pdfIn PDF document text
    • https://fenixezefabiwi.weebly.com/uploads/1/3/4/3/134315005/38fd0f88cbe003.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/xadelupuwagoxori.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/02e35.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/a5978ccc.pdfIn PDF document text
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/ca5ac47be1d090f.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/febd5fbb.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/8fd8f21d881.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/92674279-466b-4f12-b9bd-50ec691acd38/pimp_by_iceberg_slim_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d979a6-caef-4af1-862e-896699d323ca/zivitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb75b988-03bf-4803-8d10-d605630cedab/what_is_active_and_passive_transportation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba95ca7-1bc9-41e4-a464-ee6f53a997f7/sketchup_free_download_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcae2bb-5190-483d-a648-00240a8d9de4/xuvilumerekadedoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e082a5-ed12-44ac-ac2e-523c29b4b246/britax_boulevard_car_seat_expiration_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55958372-18f4-4d07-a4e9-6ddb813a7f68/86803099107.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f07b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF07B 20316 bytes
SHA-256: 8b5005caf72b011f30ab1d70a852f0708afc888b0f4e4af8d7255301ea89a164
font_01_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 4832 bytes
SHA-256: 5fad4e7e3cbaa3e6ff4bf4bea55b7b55950bcdd6192b05a27ef099fe83a32c8d
font_02_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 10496 bytes
SHA-256: 1915cfcdc90cf93e84f14a3766d9681f67d5e71f5420c864a879892aa11ff346