Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3d896c7a67cab3…

MALICIOUS

PDF

35.9 KB Created: 2020-03-25 09:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3be5345e33b05dabb99766cd57e7bb14 SHA-1: 131317b997914c3957f37d8f4164b39d44cfdcbb SHA-256: 0a3d896c7a67cab36e971f00d38c87f7b62958279f2fad9c1031dcd94c8dd5d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains a reference to calculating factorials, which may be a lure.

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://perillianconsulting.com/uploads/1/3/0/6/130604040/130604040.html#calcular+el+factorial+de+un+numero+pseint
    • http://alimosphere.com/uploads/1/3/0/7/130776889/mapelamukamobeg.pdf
    • http://myukpensiontransfer.com.au/uploads/1/3/0/5/130541624/gesukuxinime_sopareka_tewewugoxov.pdf
    • http://rebelrosiechildrensboutique.com/uploads/1/3/0/6/130621299/8925454.pdf
    • http://www.kathrynfree.com/uploads/1/3/0/3/130379274/fewebelawuta.pdf
    • http://agsolucoes.net/uploads/1/3/0/5/130588659/popofe.pdf
    • http://sel-amp.net/uploads/1/3/0/6/130621926/782f3.pdf
    • http://surrettzgroup.org/uploads/1/3/0/3/130324324/f4a193e94da.pdf
    • http://marialepine.com/uploads/1/3/0/3/130324386/wojivasapifagub.pdf
    • http://votejeremygarza.com/uploads/1/3/0/7/130775506/ad00abeb.pdf
    • http://pharmacistbritt.com/uploads/1/3/0/5/130546971/3490557.pdf
    • http://aletothechief.com/uploads/1/3/0/2/130291689/fewasok.pdf
    • http://oldaleandsons.org/uploads/1/3/0/2/130270900/temizidipufavim_sedapalal_sowuj_duvalolegulog.pdf
    • http://liquidlunch.us/uploads/1/3/0/8/130874235/bibabare.pdf
    • http://defythehand.com/uploads/1/3/0/5/130588966/31dcde.pdf
    • http://www.defyinggravity2020.com/uploads/1/3/0/6/130639836/lulumufif_jexeg.pdf
    • http://cozykin-matchmaker.com/uploads/1/3/0/5/130538988/lekulemul.pdf
    • http://saitamajalt.org/uploads/1/3/0/4/130435569/josexoxojibirozud.pdf
    • http://nebraskasolarschools.net/uploads/1/3/0/2/130287553/5398198.pdf
    • http://www.internshipadvisor.com/uploads/1/3/0/5/130538902/7919516.pdf
    • http://acnescardoctor.com/uploads/1/3/0/2/130270811/df66aede27c0252.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_off00006347.bin
fe73aec5127651222877fb6fbb9ac1f87ca2d206475901f3d258f541663325d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 7864 bytes

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