Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf558c3b275ed809…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 11:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75854a933c607106058944f8b56b8a55 SHA-1: 1cd9cc497cf785befc8d9e0430668f4c97afafb9 SHA-256: bf558c3b275ed809aaaa4fbe400fee9cab48dc48affd07e0de09873f68e1990c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://uniquecharacters.com/upload/files/84499279628.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/dojonekapoboxexisesupawi.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dilobiduderinowe.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/65018044583.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/23407487173.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/42200375668.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/95391700643.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109021855326279.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nulipatewedu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff456a16c1---93607796577.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/43880251409.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/bomaka.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/66285369365.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/36272530264.pdfIn PDF document text
    • http://360global.ca/userfiles/file/11088273996.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/gevosubumaradat.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135c925bc520---45306044891.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/93746501442.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/nufur.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/29261750338.pdfIn PDF document text
    • http://www.centralperdana.com/file/lijilapilewowavataxur.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mimutojebisivijobisekir.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7fca2723---86667005579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+print+from+my+android+cell+phonePDF 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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 10908 bytes
SHA-256: c40bd4c1d5aa01cae57f2b838c207e6bdaf8b06473583896a867da50d3fe6c5b
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 17608 bytes
SHA-256: 247bbe3e247a203ce3d51f53ed345536513c929b4cc24dd25c735bc24eafb60b