Malicious PDF — malware analysis report

Static analysis result for SHA-256 33610f0d00ffca3f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 02:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c82aeb0ad2388a69a0db12abda3a10b1 SHA-1: 16fe195506b7c1e1886cf5d70de1b1815c58c60a SHA-256: 33610f0d00ffca3f75f8dd58c3c85c330055e26ba0b8b62723a4c063e1c1e653
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+do+you+unlock+a+sim+card+on+an+iphone PDF link annotation
    • https://noddy.nu/images/file/zuvofevavesoxapelizimox.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5artv4fl8et2tfaiknnlsvas0i/tigolopejured.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/66768909721.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/41221761890.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910224443.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/govenupegevusev.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/54947860000.pdfIn PDF document text
    • https://aedwea.com/upload/foto/75380811012.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/81287764029.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/93690558333.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/sikimumosof.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/fosiwumoberut.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/mozisirejog.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/wemubuganiviloferopidogo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/44ce2b6a3a3066cda6530bcca2f82011/netiwewexugofesumed.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/17507701830.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/53966073838.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/159168601.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dusudaxobulobime.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/38364858185.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33344587814.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94741184510.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/60724887479.pdfIn PDF document text
    • http://belean.pl/userfiles/file/47994721791.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 11064 bytes
SHA-256: e785bea0024182e8ead155f932b2abe8c9af56ccc5c51ec25e091243f4a7ee0f
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 17272 bytes
SHA-256: 9a68d58d8b31c8613b8ad86b74e7c912c3e09f10b1ef88498b1bec09df840b56
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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