Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cbecb7ad4679df…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 04:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f8699200f322a4569570242e1d46538 SHA-1: 93d49b54f8a77b3cae8ea7f833900ff65c6699b6 SHA-256: 32cbecb7ad4679dfdc1727a2deeb510b7b22b23ddd41ea18126ab9ed8c5f856f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=install+play+app PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0ff5482d1d1a858c55a9ebdeff4cc7ec/25926136440.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/powifewuzavakageguw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabafukiloratemino.pdfIn PDF document text
    • https://ka-base.no/images_students/files/rizomunasotodukuwi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/98045288412.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tiriwaxo.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/66028295687.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/tisofudabupodozurezaxuf.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/99422173545.pdfIn PDF document text
    • https://el-tall.pl/pics/file/94994803955.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/39956415487.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/1266725216.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jawogulijidez.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/38733648543.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/53281029253.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/tixofawidezazejefiv.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/78122279020.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/578279393.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138eaef41e94---sibefezoj.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/51134368846.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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 18896 bytes
SHA-256: c7ae5ad559fe58c5509a75ab410d045e9e5a6200ca889385254360fbe8543c5a
font_02_sfnt_off00012cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 9868 bytes
SHA-256: a18cd14b3101054702802b08b53cce8264f4faa7a04f1c816f9614c00e928273