Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2540c4c49bb173…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 12:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 786480d304ff17475ff3e7463c255e26 SHA-1: 9876f4442f4070a7cb0b9e8ee271fe58280c5c55 SHA-256: 7c2540c4c49bb173414a615b6e704cfecce02b240e94959b9fd6d14aeea131e2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/strik?utm_term=nespresso+keeps+blinking+orange PDF link annotation
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/4533.pdfIn PDF document text
    • https://xafijaxipumin.weebly.com/uploads/1/3/5/9/135966545/4735245.pdfIn PDF document text
    • http://twoup-viktoria.online/fazezibejimizoxumixal6f9h.pdfIn PDF document text
    • http://vigastlens.xyz/zuwotevelupujunigojaguweofjo6.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/kezegikarujuxijewubofi.pdfIn PDF document text
    • http://mushygushysayings.com/wordly_wise_3000_book_10_answer_keynmm40.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/what_do_i_need_for_my_real_id_in_south_carolina.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/11018465285.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/nenam.pdfIn PDF document text
    • http://netewe8.xyz/94661943743w2o6r.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/vimanogevedej.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/5628876.pdfIn PDF document text
    • http://fitnesspack.net/performance_appraisal_form_for_teachersa5arj.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/nefekikojixu.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/nalirexofomozusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_8b2ea6924d544bc7b81a57565f864de2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a0d2e8-6871-4cf8-8bc8-e16708798671/lupejiruxofomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc98d80-221e-4dea-9c3c-d3670b8b70bb/15930260190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bca96e6-e66a-4921-bd62-c8a6d0e43f1d/tetiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1135aa7a-21c6-499a-afb9-155701b2c452/bhagavad_gita_online_hindi.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_e4d30f9267f14918a38a9be80bb1d63d.pdf?index=trueIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_2ccbda54b6b049ecbe4d8eb6ebe4e0d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4a06cf-b488-40c8-bd60-4e4cc7fec76d/tegotawaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 5160 bytes
SHA-256: dbbb2776301fda19355114df21ff7cad8e9eef0df6ee42df86076b57646ae91c
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 2268 bytes
SHA-256: cadc5f0a81d9e6a4fb32b35a9158a494a8d9caa15323165630cf35261d096584
font_03_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 11608 bytes
SHA-256: 828bc220b8c788dddf078a68fa3b6ffebe745bbe976c7ae53d6cb7278f191ee9