Malicious PDF — malware analysis report

Static analysis result for SHA-256 a512323878aba6d3…

MALICIOUS

PDF

46.6 KB Created: 2020-03-10 04:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db45ba9e4a05d3d9727240c64e58ba1d SHA-1: 2c4a46480acad941c20e2cb9cb4b6d4956e9a573 SHA-256: a512323878aba6d3fc2b5ee44d49f3887e137c329c1737c539daf3e9f30f70f9
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on newly registered domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text suggesting it is a PDF converter tool, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the numerous external links are highly suspicious.

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://vps23.pleasingfood.com/uploads/1/3/0/6/130620635/130620635.html#pdf+image+to+word+converter+ocr
    • http://genjisolutions.com/uploads/1/3/0/4/130483926/65786b63288.pdf
    • http://epiplas.com/uploads/1/3/0/5/130551949/pudoxafo.pdf
    • http://feyborn.com/uploads/1/3/0/3/130313766/vazotipelijezekozik.pdf
    • http://hbade.net/uploads/1/3/0/7/130739332/b2f6470a.pdf
    • http://balancedforlifeyogatherapy.com/uploads/1/3/0/7/130775726/003fdf.pdf
    • http://francisadu.com/uploads/1/3/0/6/130621243/7100dae085f2.pdf
    • http://www.bentcopper.com/uploads/1/3/0/8/130873710/gusewigedijiwugadob.pdf
    • http://conneracup.com/uploads/1/3/0/4/130435943/4b3b0a2f6f94b2.pdf
    • http://www.forrestbeachtakeaway.com/uploads/1/3/0/6/130640128/a14ccc06e.pdf
    • http://mta-sts.mx.prayerlifemusic.com/uploads/1/3/0/7/130775705/8772289.pdf
    • http://mail.911bodyresq.com/uploads/1/3/0/2/130289496/bagorelupo_lufelovimijire_nemeniz.pdf
    • http://ltmmobiledyno.com/uploads/1/3/0/6/130605164/menaxilagudesi-zezebomatesaf.pdf
    • http://inmobiliariadsm.com/uploads/1/3/0/5/130539642/5899016.pdf
    • http://theladsonline.com/uploads/1/3/0/4/130436242/5581056.pdf
    • http://kazemianfoundation.com/uploads/1/3/0/5/130540725/ca1d74acdec.pdf
    • http://mrfixitenterprises.com/uploads/1/3/0/5/130539097/lexiwimuvedepe_rawigu.pdf
    • http://myconnectutility.com/uploads/1/3/0/6/130639409/7921643.pdf
    • http://laurenobern.com/uploads/1/3/0/7/130775198/984386f.pdf
    • http://www.transitorium.org/uploads/1/3/0/7/130738966/8967842.pdf
    • http://divineemergence.com.au/uploads/1/3/0/5/130539179/7b22fc.pdf
    • http://mail.knocktemplens.ie/uploads/1/3/0/7/130739353/fozivev_wozefomidelil_lejigulo.pdf
    • http://californiahomebuyingcenter.com/uploads/1/3/0/7/130739917/rogizeguzixasesezep.pdf
    • http://fpcollectibles.com/uploads/1/3/0/7/130776580/nafusinezepelutonov.pdf
    • http://www.bestchoicedriving.comcastbiz.net/uploads/1/3/0/6/130621072/kevewoxaw_xavojalenizudap_fovujoviguwa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007068.bin
ecbadbd208bda810c26d63a7996729b26be965b876dc86a8882a78d66a68dd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7068 10936 bytes
font_01_sfnt_off00009789.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9789 16036 bytes

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