Malicious PDF — malware analysis report

Static analysis result for SHA-256 51074c9206b3caea…

MALICIOUS

PDF

35.5 KB Created: 2020-05-19 14:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce90386d7dc8a7659ec0a59204f06af SHA-1: f076800fc1bc557737113218772db59169f24418 SHA-256: 51074c9206b3caea60ef11ac3bb111abd1525eed835d3d2bf59078049b13c1a3
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the mass linking to external URLs, likely for SEO spam or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://calebandrewbingham.com/uploads/1/3/1/3/131379554/131379554.html#yoquieroaprobar+3+eso+lengua
    • http://frostsurveyors.com/uploads/1/3/0/7/130776885/wefadanep.pdf
    • http://bluegreenandredconstruction.com/uploads/1/3/0/6/130620919/6309121.pdf
    • http://goliveindy.com/uploads/1/3/0/5/130589244/gutetuwimukoja-faxim.pdf
    • http://immediateprovisional.com/uploads/1/3/1/3/131379113/disomibaxuxi-mijof.pdf
    • http://renewnow.me/uploads/1/3/0/4/130476917/sapikexew.pdf
    • http://totallymarriedtravellers.com/uploads/1/3/1/6/131606638/tulaju_rasoginav_mukexuf.pdf
    • http://georgereed.net/uploads/1/3/0/6/130621397/e919c64fcd1d70e.pdf
    • http://coachbeth.us/uploads/1/3/0/5/130588773/diteminodimix.pdf
    • http://insightsrhythm.com/uploads/1/3/1/4/131438079/zelexodarepuv-daladuroniku-faluxemejarod-vupedabab.pdf
    • http://nationwidepaymentprocessing.com/uploads/1/3/1/3/131397971/zipakena_wizodejujujut_zolug_mofulisef.pdf
    • http://prospectperception.com/uploads/1/3/0/6/130604198/wisodi_nosirukivalo_refidikuma_zuvazuvebexus.pdf
    • http://wearethere4you.org/uploads/1/3/0/9/130969565/debewosudolin-mimagenoboroxa-fizivolidi.pdf
    • http://vws808.com/uploads/1/3/0/2/130272290/nalirurazijalef_zosob_nurov.pdf
    • http://fullertonindiansbasketball.com/uploads/1/3/1/0/131070508/4331236.pdf
    • http://5425ameliaearhartdr.com/uploads/1/3/0/3/130313463/7817552.pdf
    • http://rebeccalcabrera.com/uploads/1/3/1/3/131383893/zuzobajofoto.pdf
    • http://teambyrne.net/uploads/1/3/0/5/130551621/fuvekalolivoji_wikilut_bopovajizaz.pdf
    • http://ezcocbd.com/uploads/1/3/0/4/130488946/jovegabominevikofeko.pdf
    • http://edelframe.com/uploads/1/3/0/6/130639808/4e9eb.pdf
    • http://getlocal411.com/uploads/1/3/0/6/130620657/9819298.pdf
    • http://walkthruitnow.net/uploads/1/3/0/8/130873784/9577613.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_off00005e03.bin
29ee67d2fb156bf9a8418e63f0505e5a6e443c587345f724273856fb278b700f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 11192 bytes