Malicious PDF — malware analysis report

Static analysis result for SHA-256 136d1884f6607ff2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6088b906ef515b2766235c61ab007718 SHA-1: b362758caedda911434ae73c31ea9281d7a98f3d SHA-256: 136d1884f6607ff286569609831c6d8b4c65e587d8b25806981343136b2e40cd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and numerous external links, many hosted on disposable domains, indicating a link farm designed to obscure the true malicious destination. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is intended to trick users into making a phone call, consistent with phishing or scam tactics. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=chrome+tv+app PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b60884f3e---fijatefisarufudenebe.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/54132663202.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/dorabiji.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/28099473914.pdfIn PDF document text
    • https://bloc-immo.com/images/wavikewolovano.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22254345256.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wobeluzizifupirejul.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/ziragoxizabupepugoxa.pdfIn PDF document text
    • http://getdol.com/page_data/file/57944103046.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/kidejadiwuwuvixodoj.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/wawadurerafokifel.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/71497188736.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/tesepigasixojejibosiwewo.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/felopizerabubo.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89410057466.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fesosufumasewemuti.pdfIn PDF document text
    • http://www.heksan.com.pl/file/laforob.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/lolibodi.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/katidezavilor.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/15372477044.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109170733497864.pdfIn PDF document text
    • http://htygroup.com/upload/files/femezixutiv.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091311592773499.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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16632 bytes
SHA-256: 8cf2bff0f95a4432aca360fef96e59039f79a0b7e4d496b2225f26c444535592
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 10204 bytes
SHA-256: e615e71c8ac5c4feb9de79bdc0636cde0785ea3a321b744e53ff9f40f12831ca
font_02_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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