Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7b335bb5cfc871…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 15:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49541782740372242e9f75195791511b SHA-1: 0caa6b5819f64360e0ef5af5c4fc4e5c1273f056 SHA-256: ff7b335bb5cfc871eed7b596e7817592e20a07f25e0c779076b72b9896c8cd76
126 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The `wkhtmltopdf` authoring application and the presence of embedded PDF objects indicate it was likely generated to host malicious links.

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://smidgel.ru/uplcv?utm_term=can+you+swap+a+sim+card+from+android+to+iphone PDF link annotation
    • https://cicadit.ro/UserFiles/file/94020869014.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/kasukisepuzajimazeg.pdfIn PDF document text
    • http://meta-min.com/files/lojedodaketesewepasojele.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/29334616265.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/23515567637.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jolugorulikisova.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4b535b4a---lekinatifomujerurugakuko.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/9073687308.pdfIn PDF document text
    • https://panama4d.com/contents/files/siraxomuze.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/12688211951.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-19/20210919145832613642.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jurubabixog.pdfIn PDF document text
    • http://parentini.it/userfiles/files/57207812818.pdfIn PDF document text
    • http://hydratrend.com/application/third_party/ckfinder/userfiles/files/78930548012.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/69596247130.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79228584164.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/55611532977.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/lawukidunalarotope.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c930dac51---40642306759.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wejezuwixopovusif.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/rugozav.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/33537621782.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/pozosovasowozuguterutaz.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/ranakowikimomizinu.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/fubezewopek.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 17272 bytes
SHA-256: 242acd8a3e9d0f56f3aec0a8aeb98a07e1937f5d20bdca76f8c24cfbfc9fad75
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 11172 bytes
SHA-256: f814a138d21cd7d36a98c39153586ba2f3f105c680a974f7e5181d66d5f89945
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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