Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce051e54d9b97ed3…

MALICIOUS

PDF

38.1 KB Created: 2020-03-22 01:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0abfd8566260949b51ebd6e62ff6e720 SHA-1: 8669f24779cbabe88f9d6b54232efd1be9186def SHA-256: ce051e54d9b97ed32a37c235a951f5de8b1c72e58c1710b7d0898abe74bd0666
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a 'PDF SEO LINK FARM' heuristic. The document body, though partially obfuscated, contains references to these external URLs, including one pointing to 'fearlessculture.org'. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to a network of linked PDF documents hosted on various domains, likely for SEO spam or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://fearlessculture.org/uploads/1/3/0/2/130270775/130270775.html#palabras+con+la+letra+imagenes
    • http://mail.homesdomains.com/uploads/1/3/0/7/130776763/kuxatedujuzo_jebalosezavaxes_vovuxesidezol_vagulewafonibo.pdf
    • http://tpnconsultingllc.com/uploads/1/3/0/7/130775045/luripumusoga_davutusozor_bisokamek_dorinibox.pdf
    • http://www.oromyojennygigharbor.com/uploads/1/3/0/4/130477420/vuwivo_voxafetof.pdf
    • http://idajanelashes.com/uploads/1/3/0/6/130621619/9115894.pdf
    • http://angusq.com/uploads/1/3/0/4/130435694/5522545.pdf
    • http://shop.rbalternatives.com/uploads/1/3/0/2/130289284/03125e364.pdf
    • http://mail.thefixstgeorge.com/uploads/1/3/0/3/130379381/cc1774ada3155.pdf
    • http://splitdecisionimprov.com/uploads/1/3/0/9/130969432/5a8ebaf5.pdf
    • http://sweiver.com/uploads/1/3/0/4/130489536/7852737.pdf
    • http://ameliaquilts.com/uploads/1/3/0/5/130550770/2551515.pdf
    • http://mapletreemw.com/uploads/1/3/0/7/130739260/6a619b75de3d90e.pdf
    • http://heromeals.ca/uploads/1/3/0/2/130287533/tiwalelar.pdf
    • http://scumofus.org/uploads/1/3/0/5/130589078/wokigizagogivu_sakim.pdf
    • http://themessageofnabiisa.org/uploads/1/3/0/5/130590383/vufawosibimuti-sipes-jepamexaxevo.pdf
    • http://ameliashomes.com/uploads/1/3/0/7/130740517/wifuwovejalu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006990.bin
611192af185ec2eb4168c5df297f5e5d18532e5be08799d66d474d74fb0c7061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6990 8884 bytes

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