Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880f3280111938e…

MALICIOUS

PDF

73.0 KB Created: 2021-06-12 07:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c081231ac3778cd93174d2bc98649c91 SHA-1: 11c1ae3dc1feb7776c5dd227dcb96338e8e8a38b SHA-256: b880f3280111938e8177b437b1baa6f1bb71eead9ddde6a3936bcd99f8ab7c57
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains keywords related to sheet music, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=feels+so+good+flugelhorn+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6013a1b2c55a1.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/e44adac27.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/2986069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fcb2450544c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60136839babde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_606a348450558.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/ridefitejudu-bogevufetuze-zuzaw.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/zivel-nubozikibomonat.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/ab1c8c70.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/nigonodirotugek_toduralojokovir_nelifi_tageg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_60102c331a0ee.pdfIn PDF document text
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/wowelubepiguza.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/302687d3-cd1c-498f-954d-982fcb24d0ed/sewotugifukafuvarefogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716db5d3-b460-4924-a6b7-2a92760cd779/53547211494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07448058-cbc8-4cf8-b089-13035c251e5a/44241524064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c15879-8232-46b3-ad59-87e04ddd7c35/56313735966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfaa68d-85cb-4ab5-93aa-0a55ff077f2b/mendota_fv44i_gas_fireplace_insert_price.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144660075/chandramukhi_full_movie_download_in_tamil.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144617460/mr_sandman_piano_sheet_music_free.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144433974/adobe_photoshop_cs3_crack_file_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb1e4bd-4c23-4d15-beaf-a120fc5d5c20/pl_sql_tutorial_with_examples_free_download.pdfIn PDF document text
    • http://vinukena.pbworks.com/f/fovixixupoduz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 5180 bytes
SHA-256: 8652e06dd01f9e2a8c96b428d1f33687193b564837c6a8ad35bf16fd37cc04ad
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10160 bytes
SHA-256: fbcb673818ae3536e8b154f6ba2e77af421067e63548626947f8ed179194615e