Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7b449b3ee030b5…

MALICIOUS

PDF

43.9 KB Created: 2020-03-29 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a69f24849d742da0598ada5a6b8f70b3 SHA-1: ab4d3d9bfbf4bf1b81f45ad327b00d3a047a92f7 SHA-256: 5d7b449b3ee030b504f417658f6b020e7b3afdcd68b041f9a827bfadb42c10cf
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as lures or downloaders.

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://liveslivedwithlaw.net/uploads/1/3/1/4/131406146/131406146.html#watch+handmaid%27s+tale+online+free+season+3+episode+11
    • http://teaysvalleyvolleyball.com/uploads/1/3/0/9/130969923/fagiso_batese_moduzogunamuxe.pdf
    • http://movingthroughboundaries.com/uploads/1/3/0/6/130621378/maridunewinamude.pdf
    • http://icloudinterview.com/uploads/1/3/0/5/130539128/ferogepijoxifituba.pdf
    • http://vdifferentassociates.com/uploads/1/3/0/3/130324418/2589726.pdf
    • http://mick-saviconstruction.com/uploads/1/3/0/9/130969703/585894.pdf
    • http://gardenmemorial.org/uploads/1/3/1/3/131379828/b7659372fddd.pdf
    • http://hashtagpoliticalconsulting.com/uploads/1/3/1/1/131163740/sosolafamuzi-fuxufiv-mizide-zimuzu.pdf
    • http://ashleymkirkpatrick.com/uploads/1/3/1/3/131382886/tuxipedo-nasefezokas.pdf
    • http://lifehouseremodeling.com/uploads/1/3/0/7/130776641/ed632bfd5ba9.pdf
    • http://sacfskitchener.com/uploads/1/3/0/2/130272582/modevoxonuzuxa.pdf
    • http://kaybaadu.com/uploads/1/3/0/7/130739163/d514a3c91f50a.pdf
    • http://blueozarks.com/uploads/1/3/0/6/130605517/a56125a.pdf
    • http://califirecbd.com/uploads/1/3/0/6/130604639/f624c7.pdf
    • http://mysteryunited.com/uploads/1/3/0/6/130603917/genaxifuzolen-mupune-wopuruloxarebup.pdf
    • http://vinbaratta.com/uploads/1/3/1/3/131384429/jivinip.pdf
    • http://svensanders.com/uploads/1/3/0/5/130588961/zekiriranozolajajowe.pdf
    • http://johnvthephotographer.net/uploads/1/3/0/3/130313376/zalekexikukevorawik.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_off000080b9.bin
5bfdc36ee9ad91adb3a45ebe4565efe93c7cfb938a3a9134c3b22454d3fab12e
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B9 8152 bytes