Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcbc58f82c43547…

MALICIOUS

PDF

87.3 KB Created: 2021-03-08 09:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ed7727ef79fa5aff8c9b814f8f670e11 SHA-1: 084f970c68bd76b9bf894e5011f992fedd4b04c5 SHA-256: 9bcbc58f82c435470f1a400a080f5f1bae750f854e730d24ba4d7c35f16d35ed
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 pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://midufefew.ru/award?keyword=lenovo+t430+docking+station PDF link annotation
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/71399.pdfIn PDF document text
    • http://helpforteam.com/best_arctic_wolf_imagesy27j9.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/4454d3b4e8a3.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/tiwudawafevu.pdfIn PDF document text
    • http://mibewoz.22web.org/analogy_worksheet_2_answer_key.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/53277101948.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/kefigufupe.pdfIn PDF document text
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/2279416.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/29656105237.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/negafatojegepa_gugukopezoko_vojikada_dipamovim.pdfIn PDF document text
    • http://hookup757.fun/wikagirupasawibonuwikwb8jo.pdfIn PDF document text
    • http://vykupavto54.ru/196063619026s850.pdfIn PDF document text
    • http://punejew.mygamesonline.org/are_transition_metal_oxides_catalysts.pdfIn PDF document text
    • http://safetymirrors.xyz/65031539285xobkd.pdfIn PDF document text
    • https://besikutusesa.weebly.com/uploads/1/3/2/6/132681218/cc87fd7844a.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/b4abc442f.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
    • http://fijosat.epizy.com/98765715625.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_88ac390522864ddd855878b1554c9efe.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_f9c6a9ecf1674b9c8716f8bdcb067614.pdf?index=trueIn PDF document text
    • http://mezigozogug.rf.gd/sivif.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_54574d133b8548e08b42f691a12037b5.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_79b4bbba0a9843c7bd991dc6bcffc834.pdf?index=trueIn PDF document text
    • http://kepinud.rf.gd/kobalt_12_inch_miter_saw_manual.pdfIn PDF document text
    • http://mafofeguf.epizy.com/day_of_the_dead_mask_template_printable.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_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 5228 bytes
SHA-256: ed980e766604edc59c8c55f9d4187b20790f44c9e138738431f08444ccf46732
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10436 bytes
SHA-256: 253e7232e83bf647ca739d777edd83b9bc068703c1f5cdc58a1da80cd98bf3f5
font_02_sfnt_off000141c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378