Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0af73f521168da…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3f7076d1db6125d327003247e8ac71ff SHA-1: 99358f524c2d0b204da8fdfc42bca9c32a5501b9 SHA-256: 2c0af73f521168dae055835b764994af36579cec192d158a1e53fac5cd0431cc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/award?keyword=dengue+cenetec+pdf PDF link annotation
    • https://napudipeludade.weebly.com/uploads/1/3/4/3/134344161/4718185.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/bXhjRYE/zombies_2_werewolves_necklace.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/6779728.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/how_do_i_bypass_incompatible_hp_ink_cartridges.pdfIn PDF document text
    • https://migomazi.weebly.com/uploads/1/3/1/4/131407029/6630924.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/ekN2ghL/airplane_games_free_online_unblocked.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/pajosisut_tetowoxu_zobakop_kosituwudowow.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/jhcghib/gomixujigurofowuxedanoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hdjjibj/25835835298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/299c5fa2-6235-45a0-8666-d2759d14f39f/79328454437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec6840c-ce52-417b-bb90-2b147b89d99b/41643351907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6558fd-0322-4d74-a7f4-02b1d524bdda/nurujuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e39a9d-d94c-47f3-82a4-d4715851b144/75073543643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c65e409-824e-49b1-ab47-8cfc4705c844/how_much_is_a_hotspot_from_verizon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92d3906-3bec-48c0-ae8a-2cbbcf4e405b/crochet_baby_hat_with_ear_flaps_free_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/como_ganar_amigos_e_influir_sobre_las_personas_precio.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/pipozubuwetotabowakulala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1d18b9-48a7-4237-bd9f-aeb09134bb29/free_sheet_music_piano_adele_make_you_feel_my_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f166ba9-d9af-4d43-9af0-00907d9ae6fd/sazekivurupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1146e372-1fdd-4acb-b94e-4bae58975cd3/john_hopkins_antibiotic_guide_app.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/74332389287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11399f23-7a67-4cbb-a324-2723d5a4c48e/samsung_hmx-f800_price.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/90741817564.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
font_00_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 4532 bytes
SHA-256: cfce0dca89154140e86111e8bf7cc880999a090a897dd66625376faab87361d4
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10204 bytes
SHA-256: 5d60d46415a938edaade59298a3acb3f1435b94e38de000ba6bf08161ed1863b
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3