Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2215a6d99c68626…

MALICIOUS

PDF

71.3 KB Created: 2021-03-13 21:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a680c8746348f42f60daf9134b73cff7 SHA-1: c2ccaa8061ce23608e1186ac2486ccd2c936263d SHA-256: c2215a6d99c68626f166cb6a6d6514939a3ec327ed57f299556d00582ce0141e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The primary URL, https://resalured.ru/strik?utm_term=unspoken+feelings+of+a+gentleman+ii+pdf, suggests a phishing or content-luring attempt. The PDF structure and numerous links indicate it's designed to redirect users to other potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=unspoken+feelings+of+a+gentleman+ii+pdf PDF link annotation
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/f53044d7c2bd115.pdfIn PDF document text
    • http://kyrgyztours.com/health_and_safety_training_materials_freegtimt.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/tesarez.pdfIn PDF document text
    • http://wamuvosuvebupa.iblogger.org/answers_to_interview_questions_for_supervisor.pdfIn PDF document text
    • https://neriguzoxivefu.weebly.com/uploads/1/3/5/3/135319498/2628138.pdfIn PDF document text
    • http://masajsalonunuz.com/versatile_sew_in_weaveb1s0f.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/xurajeguzixos-rajeguwezom-meluruxaj.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/xenowijufuniri_losakobireno_vekixuwif_gagirigipow.pdfIn PDF document text
    • http://sozetil.66ghz.com/13943570996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_66c680f4a6af412c82774e21e10ad395.pdf?index=trueIn PDF document text
    • http://bidadaweba.epizy.com/amalkanti_poem_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/kejasutosalusiz.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_9d93a0ef4d4d4616b6900b93561afd45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/business_income_spreadsheet.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/what_do_atoms_combine_to_form.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_388deabc7e86433291ebdc75ae48194c.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_903f26ff47ea4071b45ff404dd25a47f.pdf?index=trueIn PDF document text
    • http://bexovivuvere.myartsonline.com/fajijufefakalaguximap.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/bahubali_2_movie_3gp_video.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_2da0c49b5e63404a91f4ea9b1810f5b3.pdf?index=trueIn 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 5320 bytes
SHA-256: 405f199e2424d40cf1d05f0e9f115a6496a5a3f483e1202c850f159e99989e3e
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 10928 bytes
SHA-256: 154acb3762a128625faaf88f6402f5bb6a10b213dd0c9634a48d819d202f4548