Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd2cd7ec8d925fb…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81d155b6b0090adf969c5182a355f8a4 SHA-1: feba9646cabd4cd9b45f20e75047c0d50985e4dd SHA-256: 8fd2cd7ec8d925fb751d88e6264b4be1a930aeba2150cb860430f4ec2fb65a74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosts, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • 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 http://www.bongbansaigon.com/uploads/files/41342844349.pdf In PDF document text
    • http://getem.eu/files/file/43372144894.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3043372215ff4385bdf26d1d0ed96fca/niwofomewolonebovokoxu.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/16795549634.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jipupixoxex.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/71118567838.pdfIn PDF document text
    • https://dafelia.com/files/35779299617.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/61173096350.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62548778000.pdfIn PDF document text
    • http://darec.sk/files/files/gilaromesovizamewu.pdfIn PDF document text
    • http://sb-78.ru/files/file/16512361174.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/74396576744.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c0d4810e4---54885954529.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zoxedofudivovad.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/zimoletu.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/36427294435.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/68865249382.pdfIn PDF document text
    • http://jonme.net/ckupload/files/xozazakex.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xujalabupizimevo.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/wevubagojose.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/86294009721.pdfIn PDF document text
    • http://bresky.cz/res/file/zosokiv.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/wiwufazizixexivag.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/limimugukoluxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=up+full+movie+online+watchPDF 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_off0000adbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBD 10736 bytes
SHA-256: feb7499714a42cf4a73ede4cc70fd89edf3ebda14066958a8f98f8d0fb14b9dc
font_01_sfnt_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 14828 bytes
SHA-256: 11bb3f67099ae423d678507371d821a41892ba95c852e0d01e1ce2a7024bd130
font_02_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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