Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3cc6cc663dc1ef…

MALICIOUS

PDF

120.0 KB Created: 2021-04-05 19:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f953e653749039ad20bb71d796e9551 SHA-1: 26dd5068884840a2343a1956c8e6a7d8d5542ff2 SHA-256: 6a3cc6cc663dc1ef51b8b1e4e9b8cc3ca32bd889e8b339a5efd9ae4ab65ba8a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the heuristic 'PDF_SEO_LINK_FARM' specifically pointing to the creation of numerous links. While no scripts were directly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=livro+daniel+hernandes+dias+lopes+pdf PDF link annotation
    • http://piriveva.scienceontheweb.net/bhagavad_gita_700_slokas_in_telugu.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/bojoli.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/fizakogobugaki.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/501dd6b1ced84c.pdfIn PDF document text
    • https://morowuze.weebly.com/uploads/1/3/4/5/134580979/babofofuzub-tumafugazajeb-mesifumesulok-rapufiwudodana.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/mathematical_physics_by_v_balakrishnan_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/fgdicxW/wotifotaw.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/vurepusemep.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/2frjgje/19368858188.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/rebomedug/brahmachari_old_telugu_movie_songs_free.pdfIn PDF document text
    • http://ravuxisopol.rf.gd/platform_as_a_service_pricing_models.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/geguk.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/85578336628.pdfIn PDF document text
    • http://pobunutad.epizy.com/78935075838.pdfIn PDF document text
    • http://sexupoweduf.epizy.com/cds_1_2020_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/60485916883.pdfIn PDF document text
    • http://tudaditupuji.epizy.com/anet_a6_upgrades.pdfIn PDF document text
    • http://risakimo.epizy.com/82164001372.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/sukikofane.pdfIn PDF document text
    • http://zamigunuzowa.epizy.com/poweramp_cracked_apk_full.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_off0001953f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953F 5128 bytes
SHA-256: ce03330c22ee2d1795a72533275c423deba3320656f7c44d68bbb4cb2decefb8
font_01_sfnt_off0001a6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B2 14244 bytes
SHA-256: 9cdd629e74d49df697dc8a6deb770bb4f75d2db374b1b790929e85fac69d9458

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