Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ec3341cf9d3275…

MALICIOUS

PDF

41.3 KB Created: 2020-03-13 01:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc2fb0be93e8385fc884a6ebfb85cbd7 SHA-1: bc4c593e897f0941cfd6a569580737bb3f1f3400 SHA-256: f1ec3341cf9d32755abd59cfdf35515472ae50df7bd3574731c074357cd6a495
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which follow a pattern of numeric slugs and domain names associated with SEO spam or link farms. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to accounting principles and the authoring application, suggesting a lure to disguise the malicious intent of directing users to potentially harmful external sites.

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://3vgfj.bpmtc.com/uploads/1/3/0/5/130589261/130589261.html#fundamental+accounting+principles+13th+edition+pdf
    • http://liceremovalexperts.com/uploads/1/3/0/2/130270845/2084328.pdf
    • http://mail.gspcatlanta.net/uploads/1/3/0/6/130604848/mobonufo_gazibononifu_fazetarif_wimewixuxu.pdf
    • http://modtwinsetandpearls.com/uploads/1/3/0/7/130775766/688c4df.pdf
    • http://stormfilmsperu.com/uploads/1/3/0/7/130775939/6921994.pdf
    • http://www.trinitydance.com.au/uploads/1/3/0/2/130288551/kusubivonukunu.pdf
    • http://cpanel.carpetcleaninghuntsville.com/uploads/1/3/0/7/130739592/bogelujiwe-turukijoti-xedenevito.pdf
    • http://promobileroadrepair.com/uploads/1/3/0/3/130313336/dekelamabawi.pdf
    • http://emandlicustomdesigns.com/uploads/1/3/0/7/130738966/pezoxabonomimume.pdf
    • http://timothysmithactor.com/uploads/1/3/0/7/130740556/naxunu_zapuwuwexeneni.pdf
    • http://esnorte.com/uploads/1/3/0/8/130814254/463251.pdf
    • http://www.ceramicprocincinnati.com/uploads/1/3/0/4/130483294/wewiwijisiwa_mebaminijoz_sedozidifij_ziteruvabalid.pdf
    • http://houseofdavies.com/uploads/1/3/0/2/130271047/dopemi.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_off000077cf.bin
57c4f0ab74a1e8f46e29d1208ee1e94f91750d84b70c6518a1780df50fc39720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF 8280 bytes

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