Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42d50ef1267d4b…

MALICIOUS

PDF

72.6 KB Created: 2021-10-03 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26e20ce6fd35f9a093320cb2fbee5292 SHA-1: 8e4ccc91df281db2527ac9f7c9aa38bc2e42a6f9 SHA-256: dc42d50ef1267d4b1ef81a3b1bb467b69024c35492e74d5fe71d606c31a140ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://sdes.in/uploads/50202340132.pdf In PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/ruzogafajifum.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/46901898724.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/62742594627.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-23/20210923123644961086.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/pulejinigemen.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/pewuguma.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/46028931297.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lapoxitiridubusokiduk.pdfIn PDF document text
    • https://businesslife.com/content/files/85373789818.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/30527866872.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142332317b48---somazuwobenujano.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/fomefudovu.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/nirojowowesubanat.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/60538322222.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/91315460206.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/20479742597.pdfIn PDF document text
    • http://snsi.jp/image/news_file/58928336510.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/74911803339.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/zonivalotipezal.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/tabojexejuzoxebojofigoka.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/mamomag.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/napixiwekilubaxen.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/17886935685.pdfIn PDF document text
    • https://riwg.in/userfiles/file/zigusosuzimibenar.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/70079989676.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/5146696521.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/15049132586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sharpshooter+cracked+apk+2020PDF 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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 17964 bytes
SHA-256: 48610b1b4d1098677e561f1bd87d7cfcd521f9b10ec0c6aca331d1b29c893c20
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10780 bytes
SHA-256: dc47835f8beb013358c325623ec28906cc9a942948403ea234274ea089e900b2
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1