Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7879a398c9387db…

MALICIOUS

PDF

74.4 KB Created: 2021-04-14 23:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a3d66e6dba9a6a592db939b5d941f54 SHA-1: b73d32721ac922a47fe1a3a0a117dca1d93f5ac7 SHA-256: f7879a398c9387db4788e3e52f555aa978f326a3db63b4b19fc0cd45dc03b3e1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+use+a+ti-30xa+calculator+for+statistics PDF link annotation
    • http://beremoter.online/95555839955s0o3b.pdfIn PDF document text
    • http://maxist.ru/bagivqqirh.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/1bmjehd/causes_of_tuberculosis.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/4icjhii/53194723666.pdfIn PDF document text
    • http://milesnires.xyz/8583118096z7cyh.pdfIn PDF document text
    • http://xsale.trade/is_reg_262_requireddct3q.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/d4MSYQz/dulewubadotuvimiletulik.pdfIn PDF document text
    • http://neip-forum.fun/the_house_with_a_clock_in_its_walls_cast_trailerjnob5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebenok/escape_room_board_game_answers_space_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c6d7d7-8300-47e4-803b-3edae33c1895/administracion_de_medicamentos_por_via_otica_procedimiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7625a53-8672-4a54-9a46-4603ec949fa3/how_to_fix_water_softener_brine_tank.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/37807352172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d7b9ef-0ee4-4e82-bb72-2645a7691240/red_rising_pierce_brown_movie.pdfIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_b045f52c1d98481c94b3846b0f368b18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/coliformes_totais_em_alimentos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c869d5a3-c10d-4223-9db5-1aff60c673fb/41306903383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a77885-4c97-4a84-892e-3b26b1d05761/mokukijur.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_9d0fbd280d78403ab669ee187f66be5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/best_bodyweight_exercises_for_functional_strength.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/craftsman_speed_start_weedwacker_27cc_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accd5c1a-fb49-4822-9ff7-c1668663532d/93938875008.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5332 bytes
SHA-256: 9c2df2b0a93691d7385c32ff64309a958f39059119f8ea1d2be8bf018d6c615a
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 12012 bytes
SHA-256: 7731ea87e2c23f2b6a233cc79dde0d4d89b076dbbd6272c9cd110b8fed84dddd