Malicious PDF — malware analysis report

Static analysis result for SHA-256 902d35cf5d714612…

MALICIOUS

PDF

80.7 KB Created: 2021-06-10 17:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f0cfa283db6c056e1a7bc82f0d699133 SHA-1: 0392feb39ad31721312e2bbc31efb8d16e8e70ed SHA-256: 902d35cf5d714612fde86a7681f7889dedfff91164bfea7dac8d8f635ddb6043
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one pointing to `https://catamma.ru/pbw?utm_term=tom+2+hack+game`. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://catamma.ru/pbw?utm_term=tom+2+hack+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367925/normal_606dcbf495cb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcf59c19860f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fe597c0a29f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_604f6ac62d805.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409258/normal_60b72c89b9181.pdfIn PDF document text
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/3639993.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/veburamurubu-wugobasawoj-vulazowerim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_603d25d4c6218.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/09e4e70b59908.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/3036548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_6023f43bc8c35.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/9582536.pdfIn PDF document text
    • https://zipegudedore.weebly.com/uploads/1/3/1/6/131636753/rijazewipokosirimazi.pdfIn PDF document text
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/tojipoforova_divuku_juweloxije_xiboregegime.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/bosova_fivijitasur_kojivusok_kemidagogop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_60157289686b4.pdfIn PDF document text
    • https://rekilobuviren.weebly.com/uploads/1/3/1/3/131380299/tupedizajakaninuda.pdfIn PDF document text
    • https://dubamuxurel.weebly.com/uploads/1/3/4/4/134463085/dbfeeead36cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e35d4bd-62a4-43c7-a199-2b9108388a50/a_streetcar_named_desire_play_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfaa5f2-ddc1-4859-ad5a-3d79ed138b5a/suxinawenobo.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/144610887/total_english_elementary_workbook_free_download.pdfIn PDF document text
    • http://natutaliva.pbworks.com/f/69864377775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c1b6ce-0c59-4f70-83a4-f9cd5aa5984f/13508252844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1c7470-7777-4001-8a73-19ee3b7bfea3/xfinity_x1_box_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccae255-3a84-4e44-87d5-2f43ca76bd06/what_does_a_pnc_bank_check_look_like.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/55873472601.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_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 5052 bytes
SHA-256: a48e18febcfb590d23eac95b253b647ef87aa24e9cb10f70adda238ebbd61b8c
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 10772 bytes
SHA-256: f37f7980d1c9c380d008a335eb3092a2c88c8e1ac96a9e82a2a7e128ac2bdebf

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