Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0fa85dc48ec413…

MALICIOUS

PDF

70.0 KB Created: 2021-01-21 02:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: debd48913b4219a21fce279263c3bcf2 SHA-1: 81c13ea2dcf7a4f73f3e498c834740622d87fb22 SHA-256: dc0fa85dc48ec413c65ad4e56c5ab97079b0ce6030322ab1e5ba3446f9337111
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://traffnew.ru/123?utm_term=how+to+install+vivecraft+non+vr PDF link annotation
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/5396125.pdfIn PDF document text
    • https://xotonibesil.weebly.com/uploads/1/3/1/4/131407892/gezejarolozila-sokebabupijuwi-vatulonuvos.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/pugeledasekexojoregu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcef5e4c9137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff38e3c096b8.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/lejegisuri.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/6769953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fa28cc501fe4.pdfIn PDF document text
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/bofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5fac53748fc1a.pdfIn PDF document text
    • https://punobedu.weebly.com/uploads/1/3/2/6/132683181/tojijinurid.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/pijofosoruzazinozo.pdfIn PDF document text
    • https://lizunega.weebly.com/uploads/1/3/5/3/135395432/486fd5d65379c.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/certbot_renew_manual.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/439fa45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosatetirudipu.epizy.com/jasirugudadupafalovotim.pdfIn PDF document text
    • http://ketaxesam.epizy.com/4060511725.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 4988 bytes
SHA-256: 9db442f6144d7f8b131cb89fc66c33c64406867721131470e49d444d9acb9505
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 10932 bytes
SHA-256: a37db7bc79426bdd3f4b8e66e9d7b5397e35b81b39a7336e7457095cc90ef04a

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