Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b62d3d1c402fd95…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 10:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40f7745487fb1f19fb62b78359bba933 SHA-1: b639e19bc5154512d9915179fb90c08b56540030 SHA-256: 8b62d3d1c402fd955b24b6f1d41236f1d7f81f3125dd450ae143f41e61770b69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zamaro.cz/images/fcke_files/file/77224843831.pdf In PDF document text
    • http://paraglider24.de/pics/fotos/1/file/janusupu.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/75642579952.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xakipokebox.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pimemitigujutujime.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/pilirabavolefadefaniluluf.pdfIn PDF document text
    • https://invest.pl/userfiles/file/68755982099.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/vexivipobarapopaj.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/84281830870.pdfIn PDF document text
    • http://dalaichau.com/files/madojemupipig.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/14545487445.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2789715267.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/75829787728.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/82577635254.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149810d7ddb3---dojefalojeviwuwaf.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/19740923398.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ginov.pdfIn PDF document text
    • http://recviem.ru/img/upload/kumamobuvijegawowa.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/63211567867.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/93027670681.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/lejesujenigevure.pdfIn PDF document text
    • http://stonebreaker.at/71244025238.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/takafuninijisejawi.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/25303998199.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65911068487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=to+selena+with+love+read+onlinePDF link annotation
    • 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_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 17708 bytes
SHA-256: c3c2b3304a961660c03a3418796cc6f654d3037afb0903357ce050c4e97554b4
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 10460 bytes
SHA-256: 1c0a298b26cadb71a14e4210644504be8a2b8e6096dcaf92eb019c919ebd81fe