Malicious PDF — malware analysis report

Static analysis result for SHA-256 1529f7d8772cfdf8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 04:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d422d2b3c5c63f3fb6f896f09c965b12 SHA-1: 147044131a82a51af61f08699f2424efb6238dae SHA-256: 1529f7d8772cfdf827cca1b431e71b491229c9e6707adb28f919178181682f79
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URIs, one of which points to a raw IP address, and another is part of a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URIs and the link farm heuristic suggest an attempt to direct users to malicious content, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://velapower.com/glwh/UploadFile/file/2021091905043073499.pdf In PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/10832463371.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83298946511.pdfIn PDF document text
    • http://ms2oke.com/contents/files/8236295827.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/75248632689.pdfPDF link annotation
    • https://pomtco.com/technical/files/file/40245041807.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/25915613901.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/dijufevugigatuzokesabisex.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/68892924749.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/gerikanelurod.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903235255_1473822477.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/96vq2bgdnhgkg2d5kohtvijcrj/xovagaxifijotiraroxubese.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/94309193430.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/63152285510.pdfIn PDF document text
    • http://metzlerranch.com/userimages/lijupijavosononufasogupa.pdfIn PDF document text
    • http://sung1.com/upload/files/49170723134.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/43028470069.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxunegokim.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/67714585752.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/bepusuzeva.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/bewowoludiw.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631872785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tutuapp+free+download+apkPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 18156 bytes
SHA-256: 05289386605093eb9bb67ac21a5090b9b82afa8d48cd8ddbd1604011bc5ed84a
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 10472 bytes
SHA-256: 3ef22444449a15ba3923abc444bb6859e6cbff5c188ed6fb316ffb2fe0da645e
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1