Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b971ea2044710ac…

MALICIOUS

PDF

129.6 KB Created: 2021-03-24 13:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86686e0177cf6aa3456fa1d2c15039ac SHA-1: 2a85d2b80e76697576e07f2555bcc1f1564307f1 SHA-256: 3b971ea2044710ac805bc466e25afb8e9f02e4562eaa887b0adec8bf11efab36
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a T1566.001 (Spearphishing Attachment) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/123?utm_term=e+bhavageethe+kannada+song
    • http://fly-drive.online/vethathiri_maharishi_yoga_book_in_tamili6ofs.pdf
    • http://fakaripeti.xyz/90986571364yskar.pdf
    • https://lopodudox.weebly.com/uploads/1/3/4/3/134339354/tinosikoribuf.pdf
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/jututamezemawajiwoj.pdf
    • http://santand-es.com/50569916271hohwx.pdf
    • http://biomaniix.website/raju_bhai_movie_hd_video_songsw6seo.pdf
    • https://voviteri.weebly.com/uploads/1/3/4/9/134904749/4196307.pdf
    • http://circus.market/grade_12_chemistry_vsepr_worksheet_answerszav7g.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_eea15230cbf04891baa1b6b46f126c94.pdf?index=true
    • https://s3.amazonaws.com/mexavofezoxi/fibre_cement_roof_sheets_port_elizabeth.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d228dbd737a64e9b85f377a50c68adb0.pdf?index=true
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_7485caeb6b0a427a87be62161a6bc016.pdf?index=true
    • https://s3.amazonaws.com/marimejerebo/pulse_secure_vpn_client.pdf
    • https://uploads.strikinglycdn.com/files/ee472ea6-6d8b-43ea-8af9-cef696e8e615/liwepirukulesukijug.pdf
    • https://uploads.strikinglycdn.com/files/a0af5795-fcd5-475a-b933-9b1deb701c63/the_missing_movie_2003_cast.pdf
    • https://uploads.strikinglycdn.com/files/2dce5398-87b5-47c5-98a0-0a51be3ea2ed/how_to_use_knitting_loom_set.pdf
    • https://s3.amazonaws.com/bulolimepol/prime_and_composite_numbers_activity_sheets.pdf
    • https://s3.amazonaws.com/fobupojowojon/platform_checkered_vans_red.pdf
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_bd45f38c8d304fc58acbecb2abf19c31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50d42c15-7610-44d1-b448-236d8797b359/70795521882.pdf
    • https://uploads.strikinglycdn.com/files/49e77fda-1875-46e1-bc65-6b788d16037a/kawosebuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001a7a6.bin
c8a5c39a7d0c99166dcc8cc45e554aee0270dcfc8bf2451d1c67972f4159993b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A7A6 10432 bytes
font_00_sfnt_off000196f5.bin
0a7afc9c583e4571b36900895e5197fbfb2f7703dd450c4b78094204d1bedcd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x196F5 4920 bytes
font_02_sfnt_off0001c33f.bin
27958fa77e6d4710fa8895a4440bae3499c97139be9f8c8063cdcce58777a310
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C33F 10780 bytes
font_03_sfnt_off0001e7ed.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7ED 4324 bytes