Malicious PDF — malware analysis report

Static analysis result for SHA-256 928c7c2c174242b8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 05:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb34e2d896c8f19dcce6d54a9041efa3 SHA-1: bebeae5ea8d602f314fd970bbddf44ff09e54aca SHA-256: 928c7c2c174242b8eab0e78d40306714e2ff02ef83ff7a734aae8db0f6e83b2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the structure and numerous external links suggest the PDF is intended to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143c56f64a52---bilarataxawegifil.pdf In PDF document text
    • http://pravkniga.ru/files/userfiles/files/46177662481.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/ziketatori.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/50449887413.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/67992118082.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/6548083488.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/pikegidaxojegefuvet.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/45741004061.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/30210317865.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_BB89F767807707C5.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zezubegekekuji.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/dizugad.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wafamekamed.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/jatumavokofekabakamoxenez.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/85900091519.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jogelifelabifimiki.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614370d418f8c---torod.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/somakig.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/74870124316.pdfIn PDF document text
    • http://ukrfirework.com/images/file/dumopomi.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/segilove.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/9162000674.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918063657142397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+takes+up+space+on+android+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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10748 bytes
SHA-256: 9d4d62b8cc377934e1112b38bbffcb47ff1181f19540e3bf0239aab2a4c9650b
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 17620 bytes
SHA-256: e512d820139c22472a27c251780fe4905198b010024faa4a4ba6e97f4be9cbfe
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1