Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca039d79b6c789e5…

MALICIOUS

PDF

45.8 KB Created: 2020-03-29 05:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a8fb2b0ce08397cb0f4fc478771005f SHA-1: f0a95f7a27df85e61ec15a867fe069942623b3e4 SHA-256: ca039d79b6c789e5d601e3566336cb5509d069bfbbc10f94b0e96ac2556cc1b9
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to the external URLs, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

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://www.gcateam.org/uploads/1/3/0/7/130739893/130739893.html#diferencia+entre+las+plantas+y+las+algas+verdes
    • http://lifejoyfitnessitems.org/uploads/1/3/0/6/130639349/4237072.pdf
    • http://steelelanestaffblog.org/uploads/1/3/0/7/130738789/tetejab-linife.pdf
    • http://audiorewind.com/uploads/1/3/0/5/130543837/3866606.pdf
    • http://fozzcon.com/uploads/1/3/0/7/130775465/e25b010e2a74265.pdf
    • http://yuleeelectric.com/uploads/1/3/0/6/130639180/3502475.pdf
    • http://74-123-72-249.mgwnet.com/uploads/1/3/0/6/130604010/fasitazamo_vesefid_petugabot_goniroba.pdf
    • http://anthonybeastmode.com/uploads/1/3/0/6/130621509/4736760.pdf
    • http://notasportsbar.ca/uploads/1/3/0/4/130483253/vuvotemeru-dolub.pdf
    • http://liprivatetutoring.com/uploads/1/3/0/6/130639231/8576080.pdf
    • http://www.bneiakivadetroit.org/uploads/1/3/0/6/130604428/9479182.pdf
    • http://beautifulsoulspa.com/uploads/1/3/0/3/130379293/lelava.pdf
    • http://basilandwoodie.com/uploads/1/3/0/7/130775725/dejebur.pdf
    • http://artwithmrsdee.com/uploads/1/3/0/4/130483200/9d4c649710f.pdf
    • http://solit.studio/uploads/1/3/1/0/131070723/jojodo.pdf
    • http://www.mytopfoundation.com/uploads/1/3/0/4/130435772/ae56eea0bd.pdf
    • http://easttexashealingcenter.org/uploads/1/3/0/7/130739625/5596770.pdf
    • http://colonoscopylosangeles.com/uploads/1/3/0/3/130313686/suvatezeva_zutegotafofuji_vawodex.pdf
    • http://grillhousearmenia.es/uploads/1/3/0/5/130539120/5074171.pdf
    • http://intraterrestrial.net/uploads/1/3/0/2/130288551/godasonimi.pdf
    • http://catvaloreaza.com/uploads/1/3/0/7/130740465/f2270d.pdf
    • http://troyrankin.com/uploads/1/3/0/3/130379228/95a88.pdf
    • http://marshallmakes.com/uploads/1/3/0/5/130543207/nolunab-julimivisav-gonun.pdf
    • http://bergen-city.com/uploads/1/3/0/4/130436173/xazazakofoniru.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_off00008652.bin
34a49cb93a89c1b06b7a34de9187f2cbdb6ea11ea49472743a3b3cfcb3653dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8652 9836 bytes

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