Malicious PDF — malware analysis report

Static analysis result for SHA-256 13841fd901d19832…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 08:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb0dd0a64bc91e5f84606646b7d63a2c SHA-1: 4b8b4319be593266fc88614c13ab368d97915d93 SHA-256: 13841fd901d198329122daf47f237317df1af2b2139371c6983dd555dddfded7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of this lure, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/award?keyword=cathodic+protection+survey+procedures+pdf PDF link annotation
    • http://niwopofe.scienceontheweb.net/lajitunofez.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/cnibgg8/27451679506.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/9693447.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/gibutegiwugatuw_butup_kugurutamikuvo_todobos.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/58067822024.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/gdjb9id/lilaxesunonabitejej.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/wubata_webemelenaju_vovoko.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/ktNjdgd/78215982658.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/ihwgdja/3902003459.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/vaxurinivadalul.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/6igghi1/templates_for_powerpoint_presentation.pdfIn PDF document text
    • https://xikixunajaxata.weebly.com/uploads/1/3/5/9/135959014/2dc6dd.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/64515377888.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/potonuvo_woxon_xujinedefudu_demegerubewibe.pdfIn PDF document text
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/rovukesomo-jeriz-kizalizakapu-tobotalo.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/newuxazekiwukebawine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_747cda7dee7847349bba251b055bbd51.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_a9107f96205a4503b3ba85d2632b9ca4.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_4e40bbfb44aa47c7b683b33810fe7233.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/29897685213.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/92872648719.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_0cd14d3cc09b4d2298ede704cf3b9936.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/minna_no_nihongo_1_choukai_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/autocad_for_mac_free_2016.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5276 bytes
SHA-256: f6b8ebe6f6a2cd55a4aaf330f969b531f19a3ce5f708a256cd5ec8e1fa25823a
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10764 bytes
SHA-256: 878d06c128fad743250e21d348504b81245a38e58664e492988f189d430b1719
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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