Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f06de907a31a0d3…

MALICIOUS

PDF

77.2 KB Created: 2021-04-14 21:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c5cb34a1da4f1210f2229dd696c79fdf SHA-1: d6b7f23dba299a75c696df14e05ebd7c1044bf98 SHA-256: 1f06de907a31a0d3ede257d1b53648c6c5d3e90be6b4c5fbc80afd4658c3d43f
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 phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/strik?utm_term=sat+2+math+1+practice+test+pdf PDF link annotation
    • https://bebabigi.weebly.com/uploads/1/3/5/9/135977904/pekore.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/6969694.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/nijowurikuzekif_falaf_danelov.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/kigigob.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/55b7af9b2.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/2427426.pdfIn PDF document text
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/genugulaloruno.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/dalidukibis_bimija.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/1314579.pdfIn PDF document text
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/newifufoli.pdfIn PDF document text
    • https://bifupepazabar.weebly.com/uploads/1/3/4/7/134740405/vetomufasevi-pakirepixanawa.pdfIn PDF document text
    • http://reduslim-ordina.site/is_a_recumbent_bike_good_for_cardiobxsgs.pdfIn PDF document text
    • http://epipog.com/robetisiginenive3be.pdfIn PDF document text
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/nelasexisata.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/7471816.pdfIn PDF document text
    • https://jatibamed.weebly.com/uploads/1/3/4/6/134649143/kujorew_penoxubolojab.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/fegegemesiso9r439.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/family_feud_ps4_how_many_players.pdfIn PDF document text
    • http://freud.icu/pixefojunivonugikifu5p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekapoza.epizy.com/5449975390.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/gemofapukeferagupen.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/used_aeron_chair_for_sale_singapore.pdfIn PDF document text
    • http://xapipapuvujefo.epizy.com/zunugeposaroxudaxaji.pdfIn PDF document text
    • http://mokitipo.rf.gd/5787798762.pdfIn PDF document text
    • http://vusanaxipunuli.rf.gd/centripetal_force_problems.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/nudojubulob.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 5648 bytes
SHA-256: 8d0c92e942fb0630ccce4cdb25198a5fe058f0418d778b95b0337cd6e5b422ba
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10964 bytes
SHA-256: 8ac23f802926ab41b8c15ff70047ec13249a7a5478f6a12d8c840aa336bb4abb