Malicious PDF — malware analysis report

Static analysis result for SHA-256 862489cc7b2360ff…

MALICIOUS

PDF

88.1 KB Created: 2021-04-05 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcfff179c20a3a52b70e735ddbef5cdf SHA-1: 346d4511e2fe5d64b37b3291651b5363ce88852c SHA-256: 862489cc7b2360ff47d0ff0c9a1d95b2d63f3731f55a6f4beb04e4aad2edf76d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'python projects for beginners', likely intended to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+do+python+projects+for+beginners In PDF document text
    • https://koxepapo.weebly.com/uploads/1/3/3/9/133997229/3419256.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/somatic_hybridisation.pdfIn PDF document text
    • http://romakipojaxu.mygamesonline.org/fekexadovevagekebawagi.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/24825957018.pdfIn PDF document text
    • https://tifuxifig.weebly.com/uploads/1/3/2/6/132695942/5746851.pdfIn PDF document text
    • https://suruwatofu.weebly.com/uploads/1/3/4/8/134868782/ludove_fapino_nemakomavupulin.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/93511039416.pdfIn PDF document text
    • http://jobavapoxoto.22web.org/bomber_jacket_sewing_pattern.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/wevulive-givojipako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_605d8aacbc3f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_60223b2daa2ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fcc5078579ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_604eafe4ee6cb.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/car_accident_report_form.pdfIn PDF document text
    • http://bijipejip.iblogger.org/inovao_acadmica_e_aprendizagem_ativa.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/metakibeme/contempt_of_time_meaning_in_urdu.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/bovojutonovi.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/61004789344.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/main_khiladi_tu_anari_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/wewawubapu.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_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 5548 bytes
SHA-256: 81b8708de24ff5b7483e88ee642b079a3456882e27fbab75642037504b4fbb68
font_01_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 12416 bytes
SHA-256: e969d874d7f1873e94187511e6d71b7b84d8dea16bd534b810239430b4ca9b58

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