Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c59595dd51bc9…

MALICIOUS

PDF

72.9 KB Created: 2021-03-18 08:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ff68481865723d4b2dc131c7adad3573 SHA-1: 86efb562ef20cf23ba1c1c0d2bd030721d7743a5 SHA-256: 388c59595dd51bc95da1fb0f28b6d3980c72edc020a7b3d6fe73e4859a4b9040
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=puertas+de+aluminio+en+puerto+rico PDF link annotation
    • http://yazansoft.com/berupuwerokukanedediwikgqeu7.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/9jgZqdj/tunubavekarebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/bhbIsgd/34230531844.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/diferencias_entre_capitalismo_y_socialismo.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/zib06gd/59366620802.pdfIn PDF document text
    • http://ekbsite.ru/ielts_life_skills_a2_book_free_download16b2a.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/saxepuna_munim.pdfIn PDF document text
    • http://carins.info/weight_9.9_hp_mercury_outboard_motornzxi8.pdfIn PDF document text
    • https://jalupibu.weebly.com/uploads/1/3/4/5/134520797/46c1c02f739f8.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/besirovevul-sowelivudegan-kujudefuzepe-femuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/8AjjCU9/loropafuwixinaluf.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/soxojegatajatiga.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/gjgighc/equites_property_fund_limited_annual_report.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/english_idioms_list_with_meanings_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/eWje1ja/fanijimolasilanopeko.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/gexVAah/pigule.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/ihhcggE/xagetedopej.pdfIn PDF document text
    • http://salet.store/nemometoluxezoterran2b.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/1bf0f23d-f497-487b-9d6b-f625a731e7f8/91548954684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014c910a-9ecd-4c3d-bda7-6cc7a70b13d1/sam_i_am_like_green_eggs_and_ham.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 5220 bytes
SHA-256: da90e21465581baabb9ded79eaf33bb6a4625058da1f4e49d372b1bbc14cdd82
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 10608 bytes
SHA-256: 8ddb3d29857caaea157089c659a98f9da5a3e41cefeb75330f378e817706acd3
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16684 bytes
SHA-256: b63c29193854eaab96a893fde1fd6e8f220d84dc313f09445897379fa833073d