Malicious PDF — malware analysis report

Static analysis result for SHA-256 f736e2096cf9f40b…

MALICIOUS

PDF

92.4 KB Created: 2021-09-12 11:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c78c425100cfd07c5433337410568b1c SHA-1: 7aa35ca2b1644d9b9228daa613dc46b00d8bf03e SHA-256: f736e2096cf9f40b4a133f21e42304509db7b8d72b5b446a5c1ba9dba71cbfe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting its primary purpose is to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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://coretry.ru/uplcv?utm_term=yify+tv+shows+and+movies PDF link annotation
    • https://khanikango.in/file/16618949936.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/noteropam.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/lebifexepulegifegomopux.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1i1p1r8vs5fge14tko8sku1bj6/gemowokasa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/51120620098.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/zatewemaxugesusi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130939483020---87411205956.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/84651248530.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/67455565512.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/jifuxodo.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/34172210704.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/39489395135.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/45725448321.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/tuzovedatajevo.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/zamefawugo.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/18953606709.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/77840295279.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/vurafur.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/fipigorisijuvuwiditisuzel.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/mofizixafaxekarejazed.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/jilakubirepigajudomoti.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/ladavivuxefakedawer.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/73858911958.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202198112567275.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fuvomataxar.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/31684006689.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://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_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_01_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B71 10720 bytes
SHA-256: 634c6e9f019131d8b12f68d2b2c9b8853a54794a34cf31ebbc68662e73bb7a6e